TY - JOUR AU - V. L. Levin TI - Optimality conditions and exact solutions to the two-dimensional Monge--Kantorovich problem JO - Zapiski Nauchnykh Seminarov POMI PY - 2004 SP - 150 EP - 164 VL - 312 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ZNSL_2004_312_a13/ LA - ru ID - ZNSL_2004_312_a13 ER -