TY - JOUR AU - V. M. Kopytov TI - Free lattice-ordered groups JO - Algebra i logika PY - 1979 SP - 426 EP - 441 VL - 18 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AL_1979_18_4_a4/ LA - ru ID - AL_1979_18_4_a4 ER -