@article{AL_2006_45_1_a1,
     author = {A. W. Glass and N. Ya. Medvedev},
     title = {Unilateral $o${-Groups}},
     journal = {Algebra i logika},
     pages = {20--27},
     publisher = {mathdoc},
     volume = {45},
     number = {1},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2006_45_1_a1/}
}