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@article{MZ_1972__129_171814, author = {Albert Wilansky and Andrew K. Snyder}, title = {Non-Replaceable {Matrices.}}, journal = {Mathematische Zeitschrift}, pages = {21--24}, publisher = {mathdoc}, volume = {129}, year = {1972}, zbl = {0239.40004}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__129_171814/} }
Albert Wilansky; Andrew K. Snyder. Non-Replaceable Matrices.. Mathematische Zeitschrift, Tome 129 (1972), pp. 21-24. http://geodesic.mathdoc.fr/item/MZ_1972__129_171814/