@article{AL_1976_15_6_a1,
     author = {Yu. M. Gorchakov},
     title = {Subgroups of direct products},
     journal = {Algebra i logika},
     pages = {622--627},
     publisher = {mathdoc},
     volume = {15},
     number = {6},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1976_15_6_a1/}
}