Snapshot of the position of a site in the Internet: Vector space model applied to external pages. - Roberto Ulloa (CLEI, 2012)

Not Exactly Prima Facie: Understanding the Representation of the Human Through the Analysis of Faces in World Painting. - Juan-Luis Suárez; Javier de la Rosa Pérez; Roberto Ulloa (DH, 2013)

Nobility-targeting raids among the Classic Maya: Cooperation in scale-free networks persists under tournament attack when population size fluctuates. - Roberto Ulloa; Tom Froese (ALIFE, 2016)

CulSim: A simulator of emergence and resilience of cultural diversity. - Roberto Ulloa (SoftwareX, 2016)

Detecting Race and Gender Bias in Visual Representation of AI on Web Search Engines. - Mykola Makhortykh; Aleksandra Urman; Roberto Ulloa (BIAS, 2021)

Auditing Source Diversity Bias in Video Search Results Using Virtual Agents. - Aleksandra Urman; Mykola Makhortykh; Roberto Ulloa (WWW (Companion Volume), 2021)

The Matter of Chance: Auditing Web Search Results Related to the 2020 U.S. Presidential Primary Elections Across Six Search Engines. - Aleksandra Urman; Mykola Makhortykh; Roberto Ulloa (CoRR, 2021)

Algorithm Auditing at a Large-Scale: Insights from Search Engine Audits. - Roberto Ulloa; Mykola Makhortykh; Aleksandra Urman (CoRR, 2021)

Hey, Google, is it what the Holocaust looked like? Auditing algorithmic curation of visual historical content on Web search engines. - Mykola Makhortykh; Aleksandra Urman; Roberto Ulloa (First Monday, 2021)

This is what a pandemic looks like: Visual framing of COVID-19 on search engines. - Mykola Makhortykh; Aleksandra Urman; Roberto Ulloa (CoRR, 2022)

Novelty in news search: a longitudinal study of the 2020 US elections. - Roberto Ulloa; Mykola Makhortykh; Aleksandra Urman; Juhi Kulshrestha (CoRR, 2022)

To track or not to track: examining perceptions of online tracking for information behavior research. - Mykola Makhortykh; Aleksandra Urman; Teresa Gil-Lopez; Roberto Ulloa (Internet Res., 2022)

"I updated the <ref>": The evolution of references in the English Wikipedia and the implications for altmetrics. - Olga Zagovora; Roberto Ulloa; Katrin Weller; Fabian Flöck (Quant. Sci. Stud., 2022)

Where the earth is flat and 9/11 is an inside job: A comparative algorithm audit of conspiratorial information in web search results. - Aleksandra Urman; Mykola Makhortykh; Roberto Ulloa; Juhi Kulshrestha (Telematics Informatics, 2022)

Who are the users of ChatGPT? Implications for the digital divide from web tracking data. - Celina Kacperski; Roberto Ulloa; Denis Bonnay; Juhi Kulshrestha; Peter Selb; Andreas Spitz (CoRR, 2023)

Examining bias perpetuation in academic search engines: an algorithm audit of Google and Semantic Scholar. - Celina Kacperski; Mona Bielig; Mykola Makorthyk; Maryna Sydorova; Roberto Ulloa (CoRR, 2023)

Creating inclusive mobility systems: towards age and education sensitive interventions for enhancing autonomous vehicle acceptance. - Celina Kacperski; Roberto Ulloa; Jeremy Wautelet; Tobias Vogel 005; Florian L. Kutzner (CoRR, 2023)

Shall androids dream of genocides? How generative AI can change the future of memorialization of mass atrocities. - Mykola Makhortykh; Eve M. Zucker; David J. Simon; Daniel Bültmann; Roberto Ulloa (Discov. Artif. Intell., 2023)

Assessing In-context Learning and Fine-tuning for Topic Classification of German Web Data. - Julian Schelb; Andreas Spitz; Roberto Ulloa (ACL (Student Research Workshop), 2024)

Improving the quality of individual-level online information tracking: challenges of existing approaches and introduction of a new content- and long-tail sensitive academic solution. - Silke Adam; Mykola Makhortykh; Michaela Maier; Viktor Aigenseer; Aleksandra Urman; Teresa Gil-Lopez; Clara Christner; Ernesto de León; Roberto Ulloa (CoRR, 2024)

Googling the Big Lie: Search Engines, News Media, and the US 2020 Election Conspiracy. - Ernesto de León; Mykola Makhortykh; Aleksandra Urman; Roberto Ulloa (CoRR, 2024)

Beyond time delays: How web scraping distorts measures of online news consumption. - Roberto Ulloa; Frank Mangold; Felix Schmidt; Judith Gilsbach; Sebastian Stier (CoRR, 2024)

Scaling up search engine audits: Practical insights for algorithm auditing. - Roberto Ulloa; Mykola Makhortykh; Aleksandra Urman (J. Inf. Sci., 2024)

Search engine effects on news consumption: Ranking and representativeness outweigh familiarity in news selection. - Roberto Ulloa; Celina Sylwia Kacperski (New Media Soc., 2024)

Representativeness and face-ism: Gender bias in image search. - Roberto Ulloa; Ana Carolina Richter; Mykola Makhortykh; Aleksandra Urman; Celina Sylwia Kacperski (New Media Soc., 2024)

Examining bias perpetuation in academic search engines: An algorithm audit of Google and Semantic Scholar. - Celina Kacperski; Mona Bielig; Mykola Makhortykh; Maryna Sydorova; Roberto Ulloa (First Monday, 2024)

Self-directed online information search can affect policy attitudes: a randomized encouragement design with digital behavioral data. - Celina Kacperski; Roberto Ulloa; Peter Selb; Andreas Spitz; Denis Bonnay; Juhi Kulshrestha (CoRR, 2025)

Tag-Pag: A Dedicated Tool for Systematic Web Page Annotations. - Anton Pogrebnjak; Julian Schelb; Andreas Spitz; Celina Kacperski; Roberto Ulloa (CoRR, 2025)

From prosthetic memory to prosthetic denial: Auditing whether large language models are prone to mass atrocity denialism. - Roberto Ulloa; Eve M. Zucker; Daniel Bültmann; David J. Simon; Mykola Makhortykh (CoRR, 2025)

Opting Out of Generative AI: a Behavioral Experiment on the Role of Education in Perplexity AI Avoidance. - Roberto Ulloa; Juhi Kulshrestha; Celina Kacperski (CoRR, 2025)