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Idel, Martin; Soto Gaona, Sebastián; Wolf, Michael M. (2017-07-15). "Perturbation bounds for Williamson's symplectic normal form". Linear Algebra and Its Applications. 525: 45–58. arXiv:1609.01338. doi:10.1016/j.laa.2017.03.013. S2CID119578994.
Idel, Martin; Soto Gaona, Sebastián; Wolf, Michael M. (2017-07-15). "Perturbation bounds for Williamson's symplectic normal form". Linear Algebra and Its Applications. 525: 45–58. arXiv:1609.01338. doi:10.1016/j.laa.2017.03.013. S2CID119578994.