C. Kenney;A. J. Laub;M. Wette
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Algorithm 800: Fortran 77 subroutines for computing the eigenvalues of Hamiltonian matrices. I: the square-reduced method
ACM Transactions on Mathematical Software (TOMS)
Efficient methods for solving a nonsymmetric algebraic Riccati equation arising in stochastic fluid models
Journal of Computational and Applied Mathematics