A. Murua & J.M. Sanz-Serna, Averaging and computing normal forms with word series algorithms (arXiv1512.03601), in Discrete Mechanics, Geometric Integration and Lie-Butcher Series (DMGILBS, Madrid, May 2015), K. Ebrahimi Fard and M. Barbero Liñán eds., Springer, Berlin 2018, 115-137. DOI 978-3-030-01397-4_4.

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