@article{1093891206,
author = {Schumm, George F.},
title = {${\rm S}3.02={\rm S}3.03$.},
journal = {Notre Dame J. Formal Logic},
volume = {15},
number = {1},
year = {1974},
pages = { 147-148},
language = {en},
url = {http://dml.mathdoc.fr/item/1093891206}
}
Schumm, George F. ${\rm S}3.02={\rm S}3.03$.. Notre Dame J. Formal Logic, Tome 15 (1974) no. 1, pp. 147-148. http://gdmltest.u-ga.fr/item/1093891206/