TY - JOUR AU - A. A. Novikov TI - The martingale approach in problems on the time of the first crossing of nonlinear boundaries JO - Informatics and Automation PY - 1981 SP - 130 EP - 152 VL - 158 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TRSPY_1981_158_a11/ LA - ru ID - TRSPY_1981_158_a11 ER -