@article{AL_1969_8_6_a3,
     author = {M. I. Kargapolov and V. N. Remeslennikov and N. S. Romanovskii and V. A. Roman'kov and V. A. Churkin},
     title = {Algorithmic questions for $\sigma $-powered groups},
     journal = {Algebra i logika},
     pages = {643--659},
     publisher = {mathdoc},
     volume = {8},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1969_8_6_a3/}
}