TY - JOUR AU - R. R. Gadyl'shin TI - On the perturbation of the Laplacian spectrum when the boundary condition type changes on a small part of the boundary JO - Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki PY - 1996 SP - 77 EP - 88 VL - 36 IS - 7 UR - http://geodesic.mathdoc.fr/item/ZVMMF_1996_36_7_a6/ LA - ru ID - ZVMMF_1996_36_7_a6 ER -