@article{GDZPPN002402408, title = {Constency and Replaceability for Conull Matrices.}, journal = {Mathematische Zeitschrift}, volume = {105}, year = {1968}, pages = {208-212}, zbl = {0155.38801}, url = {http://dml.mathdoc.fr/item/GDZPPN002402408} }
Macphail, M.S.; Chang, S.C.; Snyder, A. Constency and Replaceability for Conull Matrices.. Mathematische Zeitschrift, Tome 105 (1968) pp. 208-212. http://gdmltest.u-ga.fr/item/GDZPPN002402408/