@article{1183500027, author = {Stopher, E. C.}, title = {Cyclic relations in point set theory}, journal = {Bull. Amer. Math. Soc.}, volume = {43}, number = {12}, year = {1937}, pages = { 686-694}, language = {en}, url = {http://dml.mathdoc.fr/item/1183500027} }
Stopher, E. C. Cyclic relations in point set theory. Bull. Amer. Math. Soc., Tome 43 (1937) no. 12, pp. 686-694. http://gdmltest.u-ga.fr/item/1183500027/