@article{1093891614, author = {Wesselkamper, T. C.}, title = {A sole sufficient operator.}, journal = {Notre Dame J. Formal Logic}, volume = {16}, number = {1}, year = {1975}, pages = { 86-88}, language = {en}, url = {http://dml.mathdoc.fr/item/1093891614} }
Wesselkamper, T. C. A sole sufficient operator.. Notre Dame J. Formal Logic, Tome 16 (1975) no. 1, pp. 86-88. http://gdmltest.u-ga.fr/item/1093891614/