@article{VMUMM_1988_5_a16,
     author = {B. S. Kashin},
     title = {A group of width problems},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {64--66},
     publisher = {mathdoc},
     number = {5},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1988_5_a16/}
}