Higham, N. J. “Numerical Analysis of a Quadratic Matrix Equation”. IMA Journal of Numerical Analysis, vol. 20, no. 4, 2000, pp. 499-1, https://doi.org/10.1093/imanum/20.4.499.
Higham, N. J. (2000). Numerical analysis of a quadratic matrix equation. IMA Journal of Numerical Analysis, 20(4), 499-519. https://doi.org/10.1093/imanum/20.4.499
Higham NJ. Numerical analysis of a quadratic matrix equation. IMA Journal of Numerical Analysis. 2000;20(4):499-51.