@article{AL_2009_48_3_a2,
     author = {A. V. Kvaschuk and A. G. Myasnikov and D. E. Serbin},
     title = {Pregroups and the big powers condition},
     journal = {Algebra i logika},
     pages = {342--377},
     publisher = {mathdoc},
     volume = {48},
     number = {3},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2009_48_3_a2/}
}