Demoures, F., F. Gay-Balmaz, S. Leyendecker, Sina Ober-Blöbaum, T.S. Ratiu, and Y. Weinand. “Discrete Variational Lie Group Formulation of Geometrically Exact Beam Dynamics.”https://doi.org/10.1007/s00211-014-0659-4__Numerische Mathematik 130(1) (2015): 73–123.https://doi.org/10.1007/s00211-014-0659-4 .