@Article{ Francoise_GARRIDO_GALLAVOTTI,

author = { Jean Pierre Francoise and PEDRO LUIS GARRIDO GALERA and GIOVANNI GALLAVOTTI } ,

title = { Rigid motions: Action-angles, relative cohomology and polynomials with roots on the unit circle  },

journal = { Journal of Mathematical Physics },

year = { 2013 },

volume = { 54 },

pages = { 032901- },

}