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@article{AM2_1991__41_2-3_137388, author = {J.L. Garc{\'\i}a-Roig}, title = {A generalization of {Ostrowski'} theorem on ultrametric inequalities.}, journal = {Aequationes mathematicae}, pages = {2--12}, publisher = {mathdoc}, volume = {41}, number = {2-3}, year = {1991}, zbl = {0723.12008}, url = {http://geodesic.mathdoc.fr/item/AM2_1991__41_2-3_137388/} }
J.L. García-Roig. A generalization of Ostrowski' theorem on ultrametric inequalities.. Aequationes mathematicae, Tome 41 (1991) no. 2-3, pp. 2-12. http://geodesic.mathdoc.fr/item/AM2_1991__41_2-3_137388/