@article{AL_2008_47_5_a0,
     author = {V. V. Bludov and V. M. Kopytov},
     title = {Extensions of lattice-ordered groups},
     journal = {Algebra i logika},
     pages = {529--540},
     year = {2008},
     volume = {47},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2008_47_5_a0/}
}