@article{PFMT_2009_1_a6,
     author = {A. F. Vasil'ev and T. I. Vasilyeva},
     title = {Recursively recognizable local formations of finite groups},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {44--50},
     publisher = {mathdoc},
     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2009_1_a6/}
}