An Arbitrary Precision Scaling and Squaring Algorithm for the Matrix Exponential. Fasi, M. and Higham, N. J. SIAM J. Matrix Anal. Appl., 40(4):1233-1256, 2019.
doi  bibtex   
@article{fahi19,
  author =        {Massimiliano Fasi and Nicholas J. Higham},
  journal =       {SIAM J. Matrix Anal. Appl.},
  number =        {4},
  pages =         {1233-1256},
  title =         {An Arbitrary Precision Scaling and Squaring Algorithm
                   for the Matrix Exponential},
  volume =        {40},
  year =          {2019},
  doi =           {10.1137/18M1228876},
}
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