@article{GDZPPN00241175X, title = {Non-Replaceable Matrices.}, journal = {Mathematische Zeitschrift}, volume = {129}, year = {1972}, pages = {21-24}, zbl = {0239.40004}, url = {http://dml.mathdoc.fr/item/GDZPPN00241175X} }
Wilansky, Albert; Snyder, Andrew K. Non-Replaceable Matrices.. Mathematische Zeitschrift, Tome 129 (1972) pp. 21-24. http://gdmltest.u-ga.fr/item/GDZPPN00241175X/