@article{1183514049,
author = {Wallace, A. D.},
title = {Cyclic invariance under multi-valued maps},
journal = {Bull. Amer. Math. Soc.},
volume = {55},
number = {12},
year = {1949},
pages = { 820-824},
language = {en},
url = {http://dml.mathdoc.fr/item/1183514049}
}
Wallace, A. D. Cyclic invariance under multi-valued maps. Bull. Amer. Math. Soc., Tome 55 (1949) no. 12, pp. 820-824. http://gdmltest.u-ga.fr/item/1183514049/