A Hypertext Model Supporting Query Mechanisms. - Foto N. Afrati; Constantinos D. Koutras (ECHT, 1990)

Many-Valued Modal Non-Monotonic Reasoning: Sequential Stable Sets and Logics with Linear Truth Spaces. - Costas D. Koutras; George Koletsos; Stathis Zachos (Fundam. Informaticae, 1999)

Many-Valued Reflexive Autoepistemic Logic. - Costas D. Koutras; Stathis Zachos (Log. J. IGPL, 2000)

Prolegomena to Concise Theories of Action. - Pavlos Peppas; Costas D. Koutras; Mary-Anne Williams (Stud Logica, 2001)

Weaker Axioms, More Ranges. - Costas D. Koutras; Pavlos Peppas (Fundam. Informaticae, 2002)

Canonicity and Completeness Results for Many-Valued Modal Logics. - Costas D. Koutras; Christos Nomikos; Pavlos Peppas (J. Appl. Non Class. Logics, 2002)

A Catalog of Weak Many-Valued Modal Axioms and their Corresponding Frame Classes. - Costas D. Koutras (J. Appl. Non Class. Logics, 2003)

Frame constructions, truth invariance and validity preservation in many-valued modal logic. - Pantelis E. Eleftheriou; Costas D. Koutras (J. Appl. Non Class. Logics, 2005)

On a Simple 3-valued Modal Language and a 3-valued Logic of 'not-fully-justified' Belief. - Costas D. Koutras; Christos Nomikos; Pavlos Peppas (Log. J. IGPL, 2008)

On a Modal Epistemic Axiom Emerging from McDermott-Doyle Logics. - Costas D. Koutras; Yorgos Zikos (Fundam. Informaticae, 2009)

Stable Belief Sets Revisited. - Costas D. Koutras; Yorgos Zikos (JELIA, 2010)

Relating Truth, Knowledge and Belief in Epistemic States. - Costas D. Koutras; Yorgos Zikos (ECSQARU, 2011)

Notions of Bisimulation for Heyting-Valued Modal Languages. - Pantelis E. Eleftheriou; Costas D. Koutras; Christos Nomikos (J. Log. Comput., 2012)

Maps in Multiple Belief Change. - Pavlos Peppas; Costas D. Koutras; Mary-Anne Williams (ACM Trans. Comput. Log., 2012)

Only-Knowing à la Halpern-Moses for Non-omniscient Rational Agents: A Preliminary Report. - Dimitris Askounis; Costas D. Koutras; Christos Moyzes; Yorgos Zikos (JELIA, 2014)

On the 'in many cases' Modality: Tableaux, Decidability, Complexity, Variants. - Costas D. Koutras; Christos Moyzes; Christos Nomikos; Yorgos Zikos (SETN, 2014)

Open Data Driven Policy Analysis and Impact Evaluation. - Panagiotis Kokkinakos; Sotirios Koussouris; Ourania I. Markaki; Costas D. Koutras; John E. Psarras; Yuri Glickman; Martin Löhe; Habin Lee (EEPM@eGOV, 2015)

Prosperity Indicators: Foundations, Concerns, and Prospects of Usage in Policy Making-The Policy Compass Approach. - Ourania I. Markaki; Panagiotis Kokkinakos; Sotirios Koussouris; Costas D. Koutras; John E. Psarras (MCIS, 2015)

Knowledge means 'all', belief means 'most'. - Dimitris Askounis; Costas D. Koutras; Yorgos Zikos (J. Appl. Non Class. Logics, 2016)

Stathis Zachos at 70! - Eleni Bakali; Panagiotis Cheilaris; Dimitris Fotakis 001; Martin Fürer; Costas D. Koutras; Euripides Markou; Christos Nomikos; Aris Pagourtzis; Christos H. Papadimitriou; Nikolaos S. Papaspyrou; Katerina Potika (CIAC, 2017)

In All But Finitely Many Possible Worlds: Model-Theoretic Investigations on 'Overwhelming Majority' Default Conditionals. - Costas D. Koutras; Christos Rantsoudis (J. Log. Lang. Inf., 2017)

A modal logic of knowledge, belief and estimation. - Costas D. Koutras; Christos Moyzes; Yorgos Zikos (J. Log. Comput., 2017)

Default Reasoning via Topology and Mathematical Analysis: A Preliminary Report. - Costas D. Koutras; Konstantinos Liaskos; Christos Moyzes; Christos Rantsoudis (KR, 2018)

A quick guided tour to the modal logic S4.2. - Aggeliki Chalki; Costas D. Koutras; Yorgos Zikos (Log. J. IGPL, 2018)

A Reconstruction of Default Conditionals within Epistemic Logic. - Costas D. Koutras; Christos Moyzes; Christos Rantsoudis (Fundam. Informaticae, 2019)

A note on the complexity of S4.2. - Aggeliki Chalki; Costas D. Koutras; Yorgos Zikos (J. Appl. Non Class. Logics, 2021)

Topological semantics for default conditional logic: preliminary report. - Costas D. Koutras; Christos Nomikos (SAC, 2022)

Default consequence relations from topology and measure theory. - Costas D. Koutras; Konstantinos Liaskos; Christos Moyzes; Christos Nomikos; Christos Rantsoudis (Ann. Math. Artif. Intell., 2022)

On weak filters and ultrafilters: Set theory from (and for) knowledge representation. - Costas D. Koutras; Christos Moyzes; Christos Nomikos; Konstantinos Tsaprounis; Yorgos Zikos (Log. J. IGPL, 2023)

Embedding the Calendar and Time Type System in Temporal Type Theory. - Georgios V. Pitsiladis; Costas D. Koutras (J. Appl. Non Class. Logics, 2025)