@article{1093891496,
author = {Chapin, E. William},
title = {Set-valued set theory. I.},
journal = {Notre Dame J. Formal Logic},
volume = {15},
number = {1},
year = {1974},
pages = { 619-634},
language = {en},
url = {http://dml.mathdoc.fr/item/1093891496}
}
Chapin, E. William. Set-valued set theory. I.. Notre Dame J. Formal Logic, Tome 15 (1974) no. 1, pp. 619-634. http://gdmltest.u-ga.fr/item/1093891496/