Beightler, Charles S.; Wilde, Douglass J. - In: Management Science 12 (1966) 5, pp. 371-379
The La Grange linear similarity transformation (completing the square) can be used to remove all cross-product terms from a quadratic form. It is shown that the La Grange transformation may be found conveniently by adapting the well-known Gauss elimination procedure for solving linear equations....