@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/