Naïve Comprehension and Contracting Implications. - Susan Rogerson; Sam Butchart (Stud Logica, 2002)

A Note on Monothetic BCI. - Sam Butchart; Tomasz Kowalski (Notre Dame J. Formal Log., 2006)

On the Algebraizability of the Implicational Fragment of Abelian Logic. - Sam Butchart; Susan Rogerson (Stud Logica, 2014)