TY - JOUR AU - I. I. Eremin TI - Questions of duality for improper problems of mathematical JO - Algebra i logika PY - 1984 SP - 624 EP - 636 VL - 23 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AL_1984_23_6_a1/ LA - ru ID - AL_1984_23_6_a1 ER -