@article{1093894719, author = {Parks, R. Zane and Chidgey, John R.}, title = {Necessity and ticket entailment.}, journal = {Notre Dame J. Formal Logic}, volume = {13}, number = {3}, year = {1972}, pages = { 224-226}, language = {en}, url = {http://dml.mathdoc.fr/item/1093894719} }
Parks, R. Zane; Chidgey, John R. Necessity and ticket entailment.. Notre Dame J. Formal Logic, Tome 13 (1972) no. 3, pp. 224-226. http://gdmltest.u-ga.fr/item/1093894719/