TY - JOUR AU - Yu. D. Golovatyj AU - S. A. Nazarov AU - O. A. Oleinik TI - The asymptotic behaviour of~eigenvalues and eigenfunctions in~problems on vibrations of a~medium with singular perturbation of the density JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1988 SP - 229 EP - 230 VL - 43 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_1988_43_5_a17/ LA - en ID - RM_1988_43_5_a17 ER -