@article{PIM_1983_N_S_33_47_a16,
     author = {Jin Bai Kim and James E. Dowdy},
     title = {On {N-dimensional} {Idempotent} {Matrices}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {119 },
     year = {1983},
     volume = {_N_S_33},
     number = {47},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1983_N_S_33_47_a16/}
}