Kitagawa, G. (1977). “An Algorithm for Solving the Matrix Equation X = F X F' + S”. International Journal of Control25 (5): 745–753. doi:10.1080/00207177708922266.
Bartels, R. H.; Stewart, G. W. (1972). “Algorithm 432: Solution of the matrix equation AX + XB = C”. Comm. ACM15 (9): 820–826. doi:10.1145/361573.361582.