J. Y. Béziau, New light on the square of oppositions and its nameless corner, Logical Investigations, vol.10, pp.218-233, 2003.

A. Moretti, Geometry for modalities? Yes: through n-opposition theory, pp.102-145, 2004.

J. Sallantin, C. Dartnell, and M. Afshar, A Pragmatic Logic of Scientific Discovery, Discovery Science. Lecture Notes in Computer Science, vol.4265, pp.231-242, 2006.
DOI : 10.1007/11893318_24
URL : https://hal.archives-ouvertes.fr/lirmm-00120020