@article{1250131655, author = {Hassett, Matthew J.}, title = {A closure property of regressive isols}, journal = {Rocky Mountain J. Math.}, volume = {2}, number = {4}, year = {1972}, pages = { 1-24}, language = {en}, url = {http://dml.mathdoc.fr/item/1250131655} }
Hassett, Matthew J. A closure property of regressive isols. Rocky Mountain J. Math., Tome 2 (1972) no. 4, pp. 1-24. http://gdmltest.u-ga.fr/item/1250131655/