TY  - JOUR
AU  - V. A. Bykovskii
TI  - Vahlen theorem for two-dimensional convergents
JO  - Matematičeskie zametki
PY  - 1999
SP  - 30
EP  - 37
VL  - 66
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1999_66_1_a3/
LA  - ru
ID  - MZM_1999_66_1_a3
ER  -