@article{1183744688, author = {Knight, Julia F.}, title = {Requirement Systems}, journal = {J. Symbolic Logic}, volume = {60}, number = {1}, year = {1995}, pages = { 222-245}, language = {en}, url = {http://dml.mathdoc.fr/item/1183744688} }
Knight, Julia F. Requirement Systems. J. Symbolic Logic, Tome 60 (1995) no. 1, pp. 222-245. http://gdmltest.u-ga.fr/item/1183744688/