@article{FPM_2002_8_3_a18,
     author = {A. V. Leont'ev},
     title = {On the ranks of direct sums},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {949--953},
     publisher = {mathdoc},
     volume = {8},
     number = {3},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2002_8_3_a18/}
}