TY  - JOUR
AU  - G. V. Zhidkov
TI  - Differential properties of functions on the sphere
JO  - Differencialʹnye uravneniâ
PY  - 1983
SP  - 2090
EP  - 2101
VL  - 19
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1983_19_12_a9/
LA  - ru
ID  - DE_1983_19_12_a9
ER  -