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@article{ELMA_1989__44_3_141463, author = {R. Vyborny and R. Nester}, title = {L'H\^opital's rule, a counterexample.}, journal = {Elemente der Mathematik}, pages = {116--121}, publisher = {mathdoc}, volume = {44}, number = {3}, year = {1989}, zbl = {0702.26003}, url = {http://geodesic.mathdoc.fr/item/ELMA_1989__44_3_141463/} }
R. Vyborny; R. Nester. L'Hôpital's rule, a counterexample.. Elemente der Mathematik, Tome 44 (1989) no. 3, pp. 116-121. http://geodesic.mathdoc.fr/item/ELMA_1989__44_3_141463/