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@article{MOMA_1989__107_3_178409, author = {Jean-Philippe Anker}, title = {A {Short} {Proof} of a {Classical} {Covering} {Lemma.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {5--8}, publisher = {mathdoc}, volume = {107}, number = {3}, year = {1989}, zbl = {0671.22001}, url = {http://geodesic.mathdoc.fr/item/MOMA_1989__107_3_178409/} }
Jean-Philippe Anker. A Short Proof of a Classical Covering Lemma.. Monatshefte für Mathematik, Tome 107 (1989) no. 3, pp. 5-8. http://geodesic.mathdoc.fr/item/MOMA_1989__107_3_178409/