TY - JOUR AU - V. L. Levin TI - A~problem of complex analysis arising in optimal control theory JO - Matematičeskie zametki PY - 1990 SP - 45 EP - 51 VL - 47 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1990_47_5_a6/ LA - ru ID - MZM_1990_47_5_a6 ER -