@article{GDZPPN002476509,
title = {Hall's Criterion as a 'Self-Refining' Result.},
journal = {Monatshefte f\"ur Mathematik},
volume = {73},
year = {1969},
pages = {139-146},
zbl = {0199.31705},
url = {http://dml.mathdoc.fr/item/GDZPPN002476509}
}
Mirsky, L. Hall's Criterion as a 'Self-Refining' Result.. Monatshefte für Mathematik, Tome 73 (1969) pp. 139-146. http://gdmltest.u-ga.fr/item/GDZPPN002476509/