On Increasing the Number of Users in (t, n) Threshold Secret Sharing Schemes. - Todorka Alexandrova; Hiroyoshi Morita (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

Realizing and evaluating mutual anonymity in P2P networks. - Chigusa Kawashima; I Gusti Bagus Baskara Nugraha; Hiroyoshi Morita; Todorka Alexandrova (ISITA, 2010)

A crowdsourcing based mobile image translation and knowledge sharing service. - Yefeng Liu; Vili Lehdonvirta; Mieke Kleppe; Todorka Alexandrova; Hiroaki Kimura; Tatsuo Nakajima (MUM, 2010)

Computational Model of Depth Perception based on Fixational Eye Movements. - Norio Tagawa; Todorka Alexandrova (VISAPP (1), 2010)

Secret images sharing scheme using two-variable one-way functions. - Todorka Alexandrova; Yoshiaki Suzuki; Kan Okubo; Norio Tagawa (WCNIS, 2010)

Gamifying intelligent environments. - Yefeng Liu; Todorka Alexandrova; Tatsuo Nakajima (Ubi-MUI @ ACM Multimedia, 2011)

Mobile Image Search via Local Crowd: A User Study. - Yefeng Liu; Todorka Alexandrova; Tatsuo Nakajima; Vili Lehdonvirta (RTCSA (2), 2011)

Digital-physical hybrid design: Enhancing real worlds with Augmented reality. - Tatsuo Nakajima; Tetsuo Yamabe; Todorka Alexandrova; Mizuki Sakamoto (SOCA, 2011)

Augmenting Trading Card Game: Playing against Virtual Characters Used in Fictional Stories. - Mizuki Sakamoto; Tatsuo Nakajima; Todorka Alexandrova (Advances in Computer Entertainment, 2012)

Family interaction for responsible natural resource consumption. - Francisco Lepe Salazar; Tetsuo Yamabe; Todorka Alexandrova; Yefeng Liu; Tatsuo Nakajima (CHI Extended Abstracts, 2012)

Value-Based Design for Gamifying Daily Activities. - Mizuki Sakamoto; Tatsuo Nakajima; Todorka Alexandrova (ICEC, 2012)

Harmonizing Virtual Forms into Traditional Artifacts to Increase Their Values. - Mizuki Sakamoto; Tatsuo Nakajima; Tetsuo Yamabe; Todorka Alexandrova (ISAmI, 2012)

Churn resilience in network coding-based anonymous P2P system. - Todorka Alexandrova; Gergely Huzsak; Hiroyoshi Morita (ISITA, 2012)

Drawing on mobile crowds via social media - Case UbiAsk: image based mobile social search across languages. - Yefeng Liu; Vili Lehdonvirta; Todorka Alexandrova; Tatsuo Nakajima (Multim. Syst., 2012)

Facilitating natural flow of information among "taste-based" groups. - Yefeng Liu; Todorka Alexandrova; Satoshi Hirade; Tatsuo Nakajima (CHI Extended Abstracts, 2013)

Achieving sustainable society through micro-level crowdfunding. - Mizuki Sakamoto; Tatsuo Nakajima; Yefeng Liu; Todorka Alexandrova (CHI Extended Abstracts, 2013)

Visual Novels: An Methodology Guideline for Pervasive Educational Games that Favors Discernment. - Francisco Lepe Salazar; Tatsuo Nakajima; Todorka Alexandrova (GPC, 2013)

Design and Evaluation of Micro-Crowdfunding: Encouraging Sustainable Behavior in Micro-Level Crowdfunding. - Mizuki Sakamoto; Tatsuo Nakajima; Yefeng Liu; Todorka Alexandrova (MindTrek, 2013)

Using stranger as sensors: temporal and geo-sensitive question answering via social media. - Yefeng Liu; Todorka Alexandrova; Tatsuo Nakajima (WWW, 2013)

Enhancing values through virtuality for intelligent artifacts that influence human attitude and behavior. - Mizuki Sakamoto; Tatsuo Nakajima; Todorka Alexandrova (Multim. Tools Appl., 2015)

One Size Does Not Fit All: Applying the Right Game Concepts for the Right Persons to Encourage Non-game Activities. - Hina Akasaki; Shoko Suzuki; Kanako Nakajima; Koko Yamabe; Mizuki Sakamoto; Todorka Alexandrova; Tatsuo Nakajima (HCI (5), 2016)

Analyzing the influence of virtuality on playful social interaction. - Mizuki Sakamoto; Todorka Alexandrova; Tatsuo Nakajima (Multim. Tools Appl., 2016)

Designing Human Behavior Through Social Influence in Mobile Crowdsourcing with Micro-communities. - Mizuki Sakamoto; Kota Gushima; Todorka Alexandrova; Tatsuo Nakajima (EGOVIS, 2017)

New lower and upper bounds on Armstrong codes. - Todorka Alexandrova; Peter G. Boyvalenkov; Attila Sali (ACCT, 2020)

General construction of integer codes correcting single error in t2-TQAM. - Todorka Alexandrova; Hristo Kostadinov; Nikolai L. Manev (Comput. Electr. Eng., 2025)