TY  - JOUR
AU  - F. I. Karpelevich
TI  - Non-negative eigenfunctions of the Beltrami--Laplace operator on symmetric spaces of non-positive curvature
JO  - Doklady Akademii Nauk
PY  - 1963
SP  - 1274
EP  - 1276
VL  - 151
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1963_151_6_a8/
LA  - ru
ID  - DAN_1963_151_6_a8
ER  -