@article{MZM_1989_46_1_a6,
     author = {L. N. Pushkin},
     title = {Metric variant of {Cassel{\textendash}Schmidt} theorem},
     journal = {Matemati\v{c}eskie zametki},
     pages = {60--66},
     year = {1989},
     volume = {46},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1989_46_1_a6/}
}