@article{ZNSL_1983_123_a11,
     author = {A. E. Bereznyi},
     title = {Discrete subexponential groups},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {155--166},
     publisher = {mathdoc},
     volume = {123},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1983_123_a11/}
}