A unified approach to constrained mechanical systems as implicit differential equations F. Barone; R. Grassini; G. Mendella — 1999 Annales de l'I.H.P. Physique théorique
Symmetries and constants of the motion for dynamics in implicit form G. Marmo; G. Mendella; W. M. Tulczyjew — 1992 Annales de l'I.H.P. Physique théorique