@article{ZNSL_1967_4_a9,
     author = {V. A. Lifshits},
     title = {On constructive groups},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {86--95},
     year = {1967},
     volume = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1967_4_a9/}
}