@article{VMUMM_1997_5_a7,
     author = {T. P. Lukashenko},
     title = {Orthosimilar nonnegative expansion systems},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {27--31},
     year = {1997},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1997_5_a7/}
}