Marsden, Jerrold E.Ratiu, Tudor S.Scheurle, Jürgen2008-11-202008-11-202008-11-20200010.1063/1.533317https://infoscience.epfl.ch/handle/20.500.14299/31479WOS:000087154400004Reduction theory and the Lagrange-Routh equationstext::journal::journal article::research article