TY - JOUR AU - A. A. Grigor'yan TI - On the set of positive solutions of the Laplace--Beltrami equation on Riemannian manifolds of a~special form JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 1987 SP - 30 EP - 37 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IVM_1987_2_a4/ LA - ru ID - IVM_1987_2_a4 ER -