A method is given for converting any procedure that finds roots into one which finds arbitrary factors. Thus the rational root test gives rise to an effective procedure for factoring polynomials over ...

L. L. Thurstone, Graphical Method of Factoring the Correlation Matrix, Proceedings of the National Academy of Sciences of the United States of America, Vol. 30, No. 6 (Jun. 15, 1944), pp. 129-134 ...