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@article{MZM_1999_66_1_a3, author = {V. A. Bykovskii}, title = {Vahlen theorem for two-dimensional convergents}, journal = {Matemati\v{c}eskie zametki}, pages = {30--37}, publisher = {mathdoc}, volume = {66}, number = {1}, year = {1999}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1999_66_1_a3/} }
V. A. Bykovskii. Vahlen theorem for two-dimensional convergents. Matematičeskie zametki, Tome 66 (1999) no. 1, pp. 30-37. http://geodesic.mathdoc.fr/item/MZM_1999_66_1_a3/
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