@article{SM_2018_209_12_a0,
     author = {S. I. Adian and V. S. Atabekyan},
     title = {Central extensions of free periodic groups},
     journal = {Sbornik. Mathematics},
     pages = {1677--1689},
     publisher = {mathdoc},
     volume = {209},
     number = {12},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2018_209_12_a0/}
}