@article{MZM_2012_91_6_a3,
     author = {S. N. Il'in},
     title = {On the {Ranks} of {Idempotent} {Matrices} over {Skew} {Semifields}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {832--839},
     publisher = {mathdoc},
     volume = {91},
     number = {6},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2012_91_6_a3/}
}