1. "Foundations of Mechanics,";R. Abraham;Second edition,1978
2. "Dynamical Systems: A Differential Geometric Approach to Symmetry and Reduction,";G. Marmo;A Wiley-Interscience Publication,1985
3. "Applicable Differential Geometry,'';M. Crampin;London Mathematical Society Lecture Note Series,1986
4. "Methods of Differential Geometry in Analytical Mechanics,'';M. de León;North-Holland Mathematics Studies,1989
5. The inverse problem in the calculus of variations and the geometry of the tangent bundle,;G. Morandi;Phys. Rep.,1990