@article{DM_1991_3_3_a6,
     author = {S. V. Sevast'yanov},
     title = {On the compact summation of vectors},
     journal = {Diskretnaya Matematika},
     pages = {66--72},
     publisher = {mathdoc},
     volume = {3},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1991_3_3_a6/}
}