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A correction
@article{CM_1939__6__235_0, author = {Thurston, H. S.}, title = {On factoring a matric polynomial with scalar coefficients}, journal = {Compositio Mathematica}, pages = {235--238}, publisher = {Johnson Reprint Corporation}, volume = {6}, year = {1939}, zbl = {0019.39101}, language = {en}, url = {http://www.numdam.org/item/CM_1939__6__235_0/} }
Thurston, H. S. On factoring a matric polynomial with scalar coefficients. Compositio Mathematica, Tome 6 (1939), pp. 235-238. http://www.numdam.org/item/CM_1939__6__235_0/