1. Solution by the separation method of the motion of a rigid body with no forces;Piña;Rev. Mex. Fis.,1997
2. Zur Quantelung des asymmetrischen Kreisels;Kramers;Z Phy.,1929
3. The non-symmetric top;Piña,1993
4. Classical Mechanics;Goldstein,1980
5. A Treatise on the Analytical Dynamics of Particles and Rigid Bodies;Whittaker,1965