TY - JOUR AU - A. D. Wentzel' TI - On the asymptotic behaviour of the first eigenvalue of a~second-order differential operator with small parameter by the higher derivatives JO - Teoriâ veroâtnostej i ee primeneniâ PY - 1975 SP - 610 EP - 613 VL - 20 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TVP_1975_20_3_a9/ LA - ru ID - TVP_1975_20_3_a9 ER -