Learning to recommend from positive evidence. - Ingo Schwab; Wolfgang Pohl; Ivan Koychev (IUI, 2000)

Tracking Changing User Interests through Prior-Learning of Context. - Ivan Koychev (AH, 2002)

Query-Based Document Skimming: A User-Centred Evaluation of Relevance Profiling. - David J. Harper; Ivan Koychev; Yixing Sun (ECIR, 2003)

Feature Selection and Generalisation for Retrieval of Textual Cases. - Nirmalie Wiratunga; Ivan Koychev; Stewart Massie (ECCBR, 2004)

The Robert Gordon University's HARD Track Experiments at TREC 2004. - David J. Harper; Gheorghe Muresan; Bicheng Liu; Ivan Koychev; Dietrich Wettschereck; Nirmalie Wiratunga (TREC, 2004)

Within-Document Retrieval: A User-Centred Evaluation of Relevance Profiling. - David J. Harper; Ivan Koychev; Yixing Sun; Iain Pirie (Inf. Retr., 2004)

Textual Feature Construction from Keywords. - Nirmalie Wiratunga; Robert Lothian; Sutanu Chakraborti; Ivan Koychev (ICCBR Workshops, 2005)

A Propositional Approach to Textual Case Indexing. - Nirmalie Wiratunga; Robert Lothian; Sutanu Chakraborti; Ivan Koychev (PKDD, 2005)

Tracking Drifting Concepts by Time Window Optimisation. - Ivan Koychev; Robert Lothian (SGAI Conf., 2005)

Computationally effective algorithm for information extraction and online review mining. - Boris Kraychev; Ivan Koychev (WIMS, 2012)

Social News Feed Recommender. - Milen Chechev; Ivan Koychev (AIMSA, 2014)

SU-FMI: System Description for SemEval-2014 Task 9 on Sentiment Analysis in Twitter. - Boris Velichkov; Borislav Kapukaranov; Ivan Grozev; Jeni Karanesheva; Todor Mihaylov; Yasen Kiprov; Preslav Nakov; Ivan Koychev; Georgi Georgiev (SemEval@COLING, 2014)

SU@PAN'2015: Experiments in Author Profiling. - Yasen Kiprov; Momchil Hardalov; Preslav Nakov; Ivan Koychev (CLEF (Working Notes), 2015)

Semi-supervised Multi-view Sentiment Analysis. - Gergana Angelova Lazarova; Ivan Koychev (ICCCI (1), 2015)

Exposing Paid Opinion Manipulation Trolls. - Todor Mihaylov; Ivan Koychev; Georgi Georgiev; Preslav Nakov (RANLP, 2015)

In Search of Credible News. - Momchil Hardalov; Ivan Koychev; Preslav Nakov (AIMSA, 2016)

PANcakes Team: A Composite System of Domain-Agnostic Features For Author Profiling. - Pepa Gencheva; Martin Boyanov; Elena Deneva; Preslav Nakov; Georgi Georgiev; Yasen Kiprov; Ivan Koychev (CLEF (Working Notes), 2016)

SU@PAN'2016: Author Obfuscation. - Tsvetomila Mihaylova; Georgi Karadjov; Yasen Kiprov; Georgi Georgiev; Ivan Koychev; Preslav Nakov (CLEF (Working Notes), 2016)

Experiments in Authorship-Link Ranking and Complete Author Clustering. - Valentin Zmiycharov; Dimitar Alexandrov; Hristo Georgiev; Yasen Kiprov; Georgi Georgiev; Ivan Koychev; Preslav Nakov (CLEF (Working Notes), 2016)

PMI-cool at SemEval-2016 Task 3: Experiments with PMI and Goodness Polarity Lexicons for Community Question Answering. - Daniel Balchev; Yasen Kiprov; Ivan Koychev; Preslav Nakov (SemEval@NAACL-HLT, 2016)

SUper Team at SemEval-2016 Task 3: Building a Feature-Rich System for Community Question Answering. - Tsvetomila Mihaylova; Pepa Gencheva; Martin Boyanov; Ivana Yovcheva; Todor Mihaylov; Momchil Hardalov; Yasen Kiprov; Daniel Balchev; Ivan Koychev; Preslav Nakov; Ivelina Nikolova; Galia Angelova (SemEval@NAACL-HLT, 2016)

The Case for Being Average: A Mediocrity Approach to Style Masking and Author Obfuscation - (Best of the Labs Track at CLEF-2017). - Georgi Karadzhov; Tsvetomila Mihaylova; Yasen Kiprov; Georgi Georgiev; Ivan Koychev; Preslav Nakov (CLEF, 2017)

Building Chatbots from Forum Data: Model Selection Using Question Answering Metrics. - Martin Boyanov; Preslav Nakov; Alessandro Moschitti; Giovanni Da San Martino; Ivan Koychev (RANLP, 2017)

A Context-Aware Approach for Detecting Worth-Checking Claims in Political Debates. - Pepa Gencheva; Preslav Nakov; Lluís Màrquez; Alberto Barrón-Cedeño; Ivan Koychev (RANLP, 2017)

We Built a Fake News / Click Bait Filter: What Happened Next Will Blow Your Mind! - Georgi Karadzhov; Pepa Gencheva; Preslav Nakov; Ivan Koychev (RANLP, 2017)

Fully Automated Fact Checking Using External Sources. - Georgi Karadzhov; Preslav Nakov; Lluís Màrquez; Alberto Barrón-Cedeño; Ivan Koychev (RANLP, 2017)

Do Not Trust the Trolls: Predicting Credibility in Community Question Answering Forums. - Preslav Nakov; Tsvetomila Mihaylova; Lluís Màrquez; Yashkumar Shiroya; Ivan Koychev (RANLP, 2017)

Large-Scale Goodness Polarity Lexicons for Community Question Answering. - Todor Mihaylov; Daniel Balchev; Yasen Kiprov; Ivan Koychev; Preslav Nakov (SIGIR, 2017)

Generating Labeled Datasets of Twitter Users. - Yasen Kiprov; Pepa Gencheva; Ivan Koychev (UMAP (Adjunct Publication), 2017)

The Case for Being Average: A Mediocrity Approach to Style Masking and Author Obfuscation. - Georgi Karadjov; Tsvetomila Mihaylova; Yasen Kiprov; Georgi Georgiev; Ivan Koychev; Preslav Nakov (CoRR, 2017)

Finding People's Professions and Nationalities Using Distant Supervision - The FMI@SU "goosefoot" team at the WSDM Cup 2017 Triple Scoring Task. - Valentin Zmiycharov; Dimitar Alexandrov; Preslav Nakov; Ivan Koychev; Yasen Kiprov (CoRR, 2017)

Towards Automated Customer Support. - Momchil Hardalov; Ivan Koychev; Preslav Nakov (AIMSA, 2018)

Recursive Style Breach Detection with Multifaceted Ensemble Learning. - Daniel Kopev; Dimitrina Zlatkova; Kristiyan Mitov; Atanas Atanasov; Momchil Hardalov; Ivan Koychev; Preslav Nakov (AIMSA, 2018)

An Ensemble-Rich Multi-Aspect Approach Towards Robust Style Change Detection: Notebook for PAN at CLEF 2018. - Dimitrina Zlatkova; Daniel Kopev; Kristiyan Mitov; Atanas Atanasov; Momchil Hardalov; Ivan Koychev; Preslav Nakov (CLEF (Working Notes), 2018)

Tweety at SemEval-2018 Task 2: Predicting Emojis using Hierarchical Attention Neural Networks and Support Vector Machine. - Daniel Kopev; Atanas Atanasov; Dimitrina Zlatkova; Momchil Hardalov; Ivan Koychev; Ivelina Nikolova; Galia Angelova (SemEval@NAACL-HLT, 2018)

The dark side of news community forums: opinion manipulation trolls. - Todor Mihaylov; Tsvetomila Mihaylova; Preslav Nakov; Lluís Màrquez; Georgi Georgiev; Ivan Koychev (Internet Res., 2018)

Detecting Deception in Political Debates Using Acoustic and Textual Features. - Daniel Kopev; Ahmed Ali 002; Ivan Koychev; Preslav Nakov (ASRU, 2019)

Fact-Checking Meets Fauxtography: Verifying Claims About Images. - Dimitrina Zlatkova; Preslav Nakov; Ivan Koychev (EMNLP/IJCNLP (1), 2019)

Predicting the Leading Political Ideology of YouTube Channels Using Acoustic, Textual, and Metadata Information. - Yoan Dinkov; Ahmed Ali 002; Ivan Koychev; Preslav Nakov (INTERSPEECH, 2019)

Detecting Toxicity in News Articles: Application to Bulgarian. - Yoan Dinkov; Ivan Koychev; Preslav Nakov (RANLP, 2019)

Beyond English-Only Reading Comprehension: Experiments in Zero-shot Multilingual Transfer for Bulgarian. - Momchil Hardalov; Ivan Koychev; Preslav Nakov (RANLP, 2019)

Deep learning contextual models for prediction of sport event outcome from sportsman's interviews. - Boris Velichkov; Ivan Koychev; Svetla Boytcheva (RANLP, 2019)

A Context-Aware Approach for Detecting Check-Worthy Claims in Political Debates. - Pepa Gencheva; Ivan Koychev; Lluís Màrquez; Alberto Barrón-Cedeño; Preslav Nakov (CoRR, 2019)

Machine Reading Comprehension for Answer Re-Ranking in Customer Support Chatbots. - Momchil Hardalov; Ivan Koychev; Preslav Nakov (Inf., 2019)

AI-driven Approach for Automatic Synthetic Patient Status Corpus Generation. - Boris Velichkov; Kristina Ivanova; Valeri Hristov; Ivan I. Borisov; Alexander Peychev; Ivan Koychev; Svetla Boytcheva (AIVR, 2020)

Cascading Approach for Automatic ICD-10 Codes Association To Diseases in Bulgarian. - Boris Velichkov; Simeon Gerginov; Panayot Panayotov; Sylvia Vassileva; Gerasim Velchev; Ivan Koychev; Svetla Boytcheva (BioInfoMed, 2020)

Team Alex at CLEF CheckThat! 2020: Identifying Check-Worthy Tweets With Transformer Models. - Alex Nikolov; Giovanni Da San Martino; Ivan Koychev; Preslav Nakov (CLEF (Working Notes), 2020)

EXAMS: A Multi-subject High School Examinations Dataset for Cross-lingual and Multilingual Question Answering. - Momchil Hardalov; Todor Mihaylov; Dimitrina Zlatkova; Yoan Dinkov; Ivan Koychev; Preslav Nakov (EMNLP (1), 2020)

Automatic Generation of Annotated Corpora of Diagnoses with ICD-10 codes based on Open Data and Linked Open Data. - Svetla Boytcheva; Boris Velichkov; Gerasim Velchev; Ivan Koychev (FedCSIS, 2020)

A Comparative Study of Extractive and Abstractive Approaches for Automatic Text Summarization on Scientific Texts. - Todor Tsonkov; Gergana Angelova Lazarova; Valentin Zmiycharov; Ivan Koychev (ERIS, 2021)

Predicting the Factuality of Reporting of News Media Using Observations about User Attention in Their YouTube Channels. - Krasimira Bozhanova; Yoan Dinkov; Ivan Koychev; Maria Castaldo; Tommaso Venturini; Preslav Nakov (RANLP, 2021)

Comparative Analysis of Fine-tuned Deep Learning Language Models for ICD-10 Classification Task for Bulgarian Language. - Boris Velichkov; Sylvia Vassileva; Simeon Gerginov; Boris Kraychev; Ivaylo Ivanov; Philip Ivanov; Ivan Koychev; Svetla Boytcheva (RANLP, 2021)

A Comparative Study on Abstractive and Extractive Approaches in Summarization of European Legislation Documents. - Valentin Zmiycharov; Milen Chechev; Gergana Angelova Lazarova; Todor Tsonkov; Ivan Koychev (RANLP, 2021)

Generating Answer Candidates for Quizzes and Answer-Aware Question Generators. - Kristiyan Vachev; Momchil Hardalov; Georgi Karadzhov; Georgi Georgiev; Ivan Koychev; Preslav Nakov (CoRR, 2021)

DuoSearch: A Novel Search Engine for Bulgarian Historical Documents. - Angel Beshirov; Suzan Hadzhieva; Ivan Koychev; Milena Dobreva (ECIR (2), 2022)

Leaf: Multiple-Choice Question Generation. - Kristiyan Vachev; Momchil Hardalov; Georgi Karadzhov; Georgi Georgiev; Ivan Koychev; Preslav Nakov (ECIR (2), 2022)

StructExtSum - Bulgarian Legislation Text Extractive Summarization by Structure Understanding. - Valentin Zmiycharov; Gergana Angelova Lazarova; Todor Tsonkov; Ivan Koychev (ERIS, 2022)

CrowdChecked: Detecting Previously Fact-Checked Claims in Social Media. - Momchil Hardalov; Anton Chernyavskiy; Ivan Koychev; Dmitry Ilvovsky; Preslav Nakov (AACL/IJCNLP (1), 2022)

Tool for Automatic Annotation of Clinical Texts in Bulgarian - BGMedAnno. - Sylvia Vassileva; Svetla Boytcheva; Ivan Koychev (ISGT, 2022)

bgGLUE: A Bulgarian General Language Understanding Evaluation Benchmark. - Momchil Hardalov; Pepa Atanasova; Todor Mihaylov; Galia Angelova; Kiril Simov; Petya Osenova; Veselin Stoyanov; Ivan Koychev; Preslav Nakov; Dragomir Radev (ACL (1), 2023)

FedSym: Unleashing the Power of Entropy for Benchmarking the Algorithms for Federated Learning. - Ensiye Kiyamousavi; Boris Kraychev; Ivan Koychev (IEEE Big Data, 2023)

Gpachov at CheckThat!-2023: A Diverse Multi-approach Ensemble for Subjectivity Detection in News Articles. - Georgi Pachov; Dimitar Dimitrov 003; Ivan Koychev; Preslav Nakov (CLEF (Working Notes), 2023)

Fusion @ BioASQ MedProcNER: Transformer-based Approach for Procedure Recognition and Linking in Spanish Clinical Text. - Sylvia Vassileva; Georgi Grazhdanski; Svetla Boytcheva; Ivan Koychev (CLEF (Working Notes), 2023)

Enriched Pre-trained Transformers for Joint Slot Filling and Intent Detection. - Momchil Hardalov; Ivan Koychev; Preslav Nakov (RANLP, 2023)

Looking for Traces of Textual Deepfakes in Bulgarian on Social Media. - Irina Temnikova; Iva Marinova; Silvia Gargova; Ruslana Margova; Ivan Koychev (RANLP, 2023)

FMI-SU at SemEval-2023 Task 7: Two-level Entailment Classification of Clinical Trials Enhanced by Contextual Data Augmentation. - Sylvia Vassileva; Georgi Grazhdanski; Svetla Boytcheva; Ivan Koychev (SemEval@ACL, 2023)

FedGrid: Federated Model Aggregation via Grid Shifting. - Boris Kraychev; Ensiye Kiyamousavi; Ivan Koychev (UCC, 2023)

Augmented reality versus standard tests to assess cognition and function in early Alzheimer's disease. - Marijn Muurling; Casper de Boer; Srinivasan Vairavan; Robbert L. Harms; Antonella Santuccione Chadha; Ioannis Tarnanas; Estefania Vilarino Luis; Dorota Religa; Martha Therese Gjestsen; Samantha Galluzzi; Marta Ibarria Sala; Ivan Koychev; et al. (npj Digit. Medicine, 2023)

EXAMS-V: A Multi-Discipline Multilingual Multimodal Exam Benchmark for Evaluating Vision Language Models. - Rocktim Jyoti Das; Simeon Emilov Hristov; Haonan Li 002; Dimitar Dimitrov 003; Ivan Koychev; Preslav Nakov (ACL (1), 2024)

Multimodal Sentiment Analysis: Recognizing Sentiment in Memes. - Georgi Vankov; Dimitar Dimitrov 003; Ivan Koychev; Preslav Nakov (AIMSA, 2024)

Mirela at CheckThat! 2024: Check-worthiness of Tweets with Multilingual Embeddings and Adversarial Training. - Mirela Dryankova; Dimitar Dimitrov 003; Ivan Koychev; Preslav Nakov (CLEF (Working Notes), 2024)

Overview of the CLEF-2024 CheckThat! Lab Task 3 on Persuasion Techniques. - Jakub Piskorski; Nicolas Stefanovitch; Firoj Alam; Ricardo Campos 001; Dimitar Dimitrov 003; Alípio Jorge; Senja Pollak; Nikolay Ribin; Zoran Fijavz; Maram Hasanain; Purificação Silvano; Elisa Sartori; et al. (CLEF (Working Notes), 2024)

Overview of the CLEF-2024 CheckThat! Lab Task 2 on Subjectivity in News Articles. - Julia Maria Struß; Federico Ruggeri; Alberto Barrón-Cedeño; Firoj Alam; Dimitar Dimitrov 003; Andrea Galassi; Georgi Pachov; Ivan Koychev; Preslav Nakov; Melanie Siegel; Michael Wiegand; Maram Hasanain; et al. (CLEF (Working Notes), 2024)

Detecting Check-Worthy Claims in Political Debates, Speeches, and Interviews Using Audio Data. - Petar Ivanov; Ivan Koychev; Momchil Hardalov; Preslav Nakov (ICASSP, 2024)

FedDyS: Enhancing Federated Learning Efficiency with Dynamic Sample Selection. - Ensiye Kiyamousavi; Boris Kraychev; Ivan Koychev (ISCC, 2024)

EXAMS-V: A Multi-Discipline Multilingual Multimodal Exam Benchmark for Evaluating Vision Language Models. - Rocktim Jyoti Das; Simeon Emilov Hristov; Haonan Li 002; Dimitar Iliyanov Dimitrov; Ivan Koychev; Preslav Nakov (CoRR, 2024)

Transformer-based approach for symptom recognition and multilingual linking. - Sylvia Vassileva; Georgi Grazhdanski; Ivan Koychev; Svetla Boytcheva (Database J. Biol. Databases Curation, 2024)

Drinov Orthography for Post-OCR Correction dataset. - Angel Beshirov; Milena Dobreva; Dimitar Dimitrov 003; Momchil Hardalov; Ivan Koychev; Preslav Nakov (Zenodo, 2024)

Overview of ImageCLEF 2025: Multimedia Retrieval in Medical, Social Media and Content Recommendation Applications. - Bogdan Ionescu; Henning Müller; Dan-Cristian Stanciu; Alexandra-Georgiana Andrei; Ahmedkhan Radzhabov; Yuri Prokopchuk; Liviu-Daniel Stefan; Mihai Gabriel Constantin; Mihai Dogariu; Vassili Kovalev; Hendrik Damm; Johannes Rückert; et al. (CLEF, 2025)

ImageCLEF 2025: Multimedia Retrieval in Medical, Social Media and Content Recommendation Applications. - Bogdan Ionescu; Henning Müller; Dan-Cristian Stanciu; Ahmad Idrissi-Yaghir; Ahmedkhan Radzhabov; Alba García Seco de Herrera; Alexandra Andrei; Andrea M. Storås; Asma Ben Abacha; Benjamin Bracke; Benjamin Lecouteux; Benno Stein 001; et al. (ECIR (5), 2025)

Post-ocr text correction for Bulgarian historical documents. - Angel Beshirov; Milena Dobreva; Dimitar Dimitrov 003; Momchil Hardalov; Ivan Koychev; Preslav Nakov (Int. J. Digit. Libr., 2025)

FinChain: A Symbolic Benchmark for Verifiable Chain-of-Thought Financial Reasoning. - Zhuohan Xie; Dhruv Sahnan; Debopriyo Banerjee; Georgi Georgiev; Rushil Thareja; Hachem Madmoun; Jinyan Su; Aaryamonvikram Singh; Yuxia Wang; Rui Xing; Fajri Koto; Haonan Li 002; et al. (CoRR, 2025)