@article{AL_1983_22_4_a5,
     author = {N. Ya. Medvedev},
     title = {Certain questions of the theory of partially ordered groups},
     journal = {Algebra i logika},
     pages = {435--442},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1983_22_4_a5/}
}