TY - JOUR AU - Yu. Knezhevich-Milyanovich TI - Estimates of the minimal eigenvalue of self-adjoint second-order differential operators JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 2000 SP - 342 EP - 344 VL - 55 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_2000_55_2_a10/ LA - en ID - RM_2000_55_2_a10 ER -