TY - JOUR AU - A. V. Kochergin TI - Nondegenerate Saddle Points and the Absence of Mixing in Flows on Surfaces JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 2007 SP - 252 EP - 266 VL - 256 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TM_2007_256_a12/ LA - ru ID - TM_2007_256_a12 ER -