TY - JOUR AU - D. E. Pal'chunov TI - Direct summands of Boolean algebras with distinguished JO - Algebra i logika PY - 1992 SP - 499 EP - 537 VL - 31 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AL_1992_31_5_a3/ LA - ru ID - AL_1992_31_5_a3 ER -