TY - JOUR AU - Ryabykh, V.G. TI - A necessary and sufficient condition for existence of extremal functions of a linear functional on . JO - Sibirskij Matematicheskij Zhurnal PY - 2007 SP - 1351 VL - 48 IS - 6 PB - mathdoc UR - https://geodesic-test.mathdoc.fr/item/SMZ_2007__48_6_55676/ LA - en ID - SMZ_2007__48_6_55676 ER -