%0 Journal Article %A V. M. Kopytov %A N. Ya. Medvedev %T Varieties of lattice-ordered groups %J Algebra i logika %D 1977 %P 417-423 %V 16 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/AL_1977_16_4_a3/ %G ru %F AL_1977_16_4_a3