Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{AMLG_1975__17_137909, author = {Charles G. Morgan}, title = {Liberated versions of {T,} {S4,} and {S5.}}, journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung}, pages = {85--90}, publisher = {mathdoc}, volume = {17}, year = {1975}, zbl = {0316.02028}, url = {http://geodesic.mathdoc.fr/item/AMLG_1975__17_137909/} }
Charles G. Morgan. Liberated versions of T, S4, and S5.. Archiv für mathematische Logik und Grundlagenforschung, Tome 17 (1975), pp. 85-90. http://geodesic.mathdoc.fr/item/AMLG_1975__17_137909/