@article{1093634400, author = {Purdy, William C.}, title = {A variable-free logic for mass terms.}, journal = {Notre Dame J. Formal Logic}, volume = {33}, number = {3}, year = {1992}, pages = { 348-358}, language = {en}, url = {http://dml.mathdoc.fr/item/1093634400} }
Purdy, William C. A variable-free logic for mass terms.. Notre Dame J. Formal Logic, Tome 33 (1992) no. 3, pp. 348-358. http://gdmltest.u-ga.fr/item/1093634400/