@article{FAA_2000_34_4_a11,
     author = {V. I. Rabanovich and Yu. S. Samoilenko},
     title = {When a {Sum} of {Idempotents} or {Projections} is a {Multiple} of the {Identity}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {91--93},
     publisher = {mathdoc},
     volume = {34},
     number = {4},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_2000_34_4_a11/}
}