@article{MAIS_2012_19_2_a7,
     author = {E. A. Timofeev},
     title = {Balls in sequence spaces},
     journal = {Modelirovanie i analiz informacionnyh sistem},
     pages = {109--114},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAIS_2012_19_2_a7/}
}