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    ".. [1] Awad H. Al-Mohy and Nicholas J. Higham (2009)",
    "       Computing the Frechet Derivative of the Matrix Exponential,",
    "       with an application to Condition Number Estimation.",
    "       SIAM Journal On Matrix Analysis and Applications.,",
    "       30 (4). pp. 1639-1657. ISSN 1095-7162"
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