@article{GDZPPN002486490, title = {A Short Proof of a Classical Covering Lemma.}, journal = {Monatshefte f\"ur Mathematik}, volume = {108}, year = {1989}, pages = {5-8}, zbl = {0671.22001}, url = {http://dml.mathdoc.fr/item/GDZPPN002486490} }
Anker, Jean-Philippe. A Short Proof of a Classical Covering Lemma.. Monatshefte für Mathematik, Tome 108 (1989) pp. 5-8. http://gdmltest.u-ga.fr/item/GDZPPN002486490/