@article{ZNSL_1980_103_a7,
     author = {P. W. Gawron and L. Yu. Kolotilina},
     title = {On subgroups of $T$-groups},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {62--65},
     publisher = {mathdoc},
     volume = {103},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1980_103_a7/}
}