Inconsistency of GPK + AFA. - Olivier Esser (Math. Log. Q., 1996)

An Interpretation of the Zermelo-Fraenkel Set Theory and the Kelley-Morse Set Theory in a Positive Theory. - Olivier Esser (Math. Log. Q., 1997)

On the Consistency of a Positive Theory. - Olivier Esser (Math. Log. Q., 1999)

Antifoundation and Transitive Closure in the System of Zermelo. - Olivier Esser; Roland Hinnion (Notre Dame J. Formal Log., 1999)

Inconsistency of The Axiom of Choice with The Positive Theory GPK+infinite. - Olivier Esser (J. Symb. Log., 2000)

Fixed-points of Set-continuous Operators. - Daniel Dzierzgowski; Olivier Esser; Roland Hinnion (Math. Log. Q., 2000)

Large Cardinals and Ramifiability for Directed Sets. - Olivier Esser; Roland Hinnion (Math. Log. Q., 2000)

Combinatorial Criteria for Ramifiable Ordered Sets. - Olivier Esser; Roland Hinnion (Math. Log. Q., 2001)

Tree-Properties for Ordered Sets. - Olivier Esser; Roland Hinnion (Math. Log. Q., 2002)

On the axiom of extensionality in the positive set theory. - Olivier Esser (Math. Log. Q., 2003)

A Strong Model of Paraconsistent Logic. - Olivier Esser (Notre Dame J. Formal Log., 2003)

Mildly Ineffable Cardinals and Hiperuniverces. - Olivier Esser (Reports Math. Log., 2003)

On topological set theory. - Thierry Libert; Olivier Esser (Math. Log. Q., 2005)

Forcing with the Anti-Foundation axiom. - Olivier Esser (Math. Log. Q., 2012)