TY  - JOUR
AU  - L. A. Takhtadzhyan
TI  - Asymptotic formula for the sum of the lengths of the periods of the quadratic irrationalities of discriminant~$D$
JO  - Zapiski Nauchnykh Seminarov POMI
PY  - 1979
SP  - 134
EP  - 144
VL  - 91
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ZNSL_1979_91_a9/
LA  - ru
ID  - ZNSL_1979_91_a9
ER  -