@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/