Geodesic
Indeterminacies of Functions of Many Variables
Matematičeskoe obrazovanie, Tome 23 (2002) no. 4, pp. 90-100.

Voir la notice de l'article provenant de la source Math-Net.Ru

The well-known L'Hospital's rule is generalized for the case of real-valued functions of two real variables. 
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V. V. Ivlev. Indeterminacies of Functions of Many Variables. Matematičeskoe obrazovanie, Tome 23 (2002) no. 4, pp. 90-100. http://geodesic.mathdoc.fr/item/MO_2002_23_4_a3/