TY - JOUR AU - Yu. Sh. Gurevich TI - The problem of the solution of problems of solution JO - Algebra i logika PY - 1969 SP - 640 EP - 642 VL - 8 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AL_1969_8_6_a2/ LA - ru ID - AL_1969_8_6_a2 ER -