On regular modal logics with axiom □ ⊤ → □□ ⊤. - Kazimierz Swirydowicz (Stud Logica, 1990)

A Remark on the Maximal Extensions of the Relevant Logic R. - Kazimierz Swirydowicz (Reports Math. Log., 1995)

There Exist Exactly Two Maximal Strictly Relevant Extensions of The Relevant Logic R. - Kazimierz Swirydowicz (J. Symb. Log., 1999)

Upper Part of the Lattice of Extensions of the Positive Relevant Logic R+. - Kazimierz Swirydowicz (Reports Math. Log., 2006)

There exists an uncountable set of pretabular extensions of the relevant logic R and each logic of this set is generated by a variety of finite height. - Kazimierz Swirydowicz (J. Symb. Log., 2008)

Structural Completeness in Relevance Logics. - James G. Raftery 001; Kazimierz Swirydowicz (Stud Logica, 2016)