@article{RM_1980_35_2_a10,
     author = {S. Kotanov},
     title = {Mobility and extension of fundamental sequences},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {243--244},
     publisher = {mathdoc},
     volume = {35},
     number = {2},
     year = {1980},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1980_35_2_a10/}
}