TY - JOUR AU - M. M. Gekhtman TI - Existence of surface conditions for nonclassical self-adjoint extensions of the Laplace operator JO - Funkcionalʹnyj analiz i ego priloženiâ PY - 1982 SP - 62 EP - 63 VL - 16 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FAA_1982_16_1_a9/ LA - ru ID - FAA_1982_16_1_a9 ER -