@article{10_4153_CMB_1971_046_6,
     author = {Gibson, P. M.},
     title = {Rank of the {Sum} of {Certain} {Matrices}},
     journal = {Canadian mathematical bulletin},
     pages = {257--257},
     year = {1971},
     volume = {14},
     number = {2},
     doi = {10.4153/CMB-1971-046-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-046-6/}
}