@article{10_4153_CMB_1965_013_2,
     author = {Macphail, M. S.},
     title = {Remark on {Co-Null} {Matrices}},
     journal = {Canadian mathematical bulletin},
     pages = {105--107},
     year = {1965},
     volume = {8},
     number = {1},
     doi = {10.4153/CMB-1965-013-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1965-013-2/}
}