@article{AL_1986_25_1_a4,
     author = {V. P. Shunkov},
     title = {On the definition of $M_p$-groups},
     journal = {Algebra i logika},
     pages = {111--113},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1986_25_1_a4/}
}