@article{1093891805, author = {Gersting, Judith}, title = {Universal pairs of regressive isols.}, journal = {Notre Dame J. Formal Logic}, volume = {16}, number = {1}, year = {1975}, pages = { 409-414}, language = {en}, url = {http://dml.mathdoc.fr/item/1093891805} }
Gersting, Judith. Universal pairs of regressive isols.. Notre Dame J. Formal Logic, Tome 16 (1975) no. 1, pp. 409-414. http://gdmltest.u-ga.fr/item/1093891805/