TY - JOUR AU - Kh. P. Rustamov TI - Characterization of fractional powers of the Beltrami--Laplace operator on a sphere by means of fractional finite differences JO - Doklady Akademii Nauk PY - 1992 SP - 938 EP - 943 VL - 324 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1992_324_5_a4/ LA - ru ID - DAN_1992_324_5_a4 ER -