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)

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)

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

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

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

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

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)