@article{GDZPPN002082292,
title = {L'H\^opital's rule, a counterexample.},
journal = {Elemente der Mathematik},
volume = {44},
year = {1989},
pages = {116-121},
zbl = {0702.26003},
url = {http://dml.mathdoc.fr/item/GDZPPN002082292}
}
Vyborny, R.; Nester, R. L'Hôpital's rule, a counterexample.. Elemente der Mathematik, Tome 44 (1989) pp. 116-121. http://gdmltest.u-ga.fr/item/GDZPPN002082292/