A Solution to the Completeness Problem for Weakly Aggregative Modal Logic. - Peter Apostoli; Bryson Brown (J. Symb. Log., 1995)

Modal Aggregation and the Theory of Paraconsistent Filters. - Peter Apostoli (Math. Log. Q., 1996)

On the completeness of first degree weakly aggregative modal logics. - Peter Apostoli (J. Philos. Log., 1997)

Approximation Spaces of Type-Free Sets. - Peter Apostoli; Akira Kanda (Rough Sets and Current Trends in Computing, 2000)

The Analytic Conception of Truth and The Foundations of Arithmetic. - Peter Apostoli (J. Symb. Log., 2000)

Upper and Lower Recursion Schemes in Abstract Approximation Spaces. - Peter Apostoli; Akira Kanda (RSFDGrC, 2003)

First Steps Towards Computably-Infinite Information Systems. - Peter Apostoli; Akira Kanda; Lech Polkowski (Trans. Rough Sets, 2004)

Proximity Spaces of Exact Sets. - Peter Apostoli; Akira Kanda (RSFDGrC (1), 2005)