Lagrangian theory for presymplectic systems M. C. Muñoz Lecanda; N. Roman Roy — 1992 Annales de l'I.H.P. Physique théorique
Implicit quasilinear differential systems: A geometrical approach. Muñoz-Lecanda, Miguel C.; Román-Roy, N. — 1999 Electronic Journal of Differential Equations (EJDE) [electronic only]
A geometrical analysis of the field equations in field theory. Echeverría-Enríquez, A.; Muñoz-Lecanda, M.C.; Román-Roy, N. — 2002 International Journal of Mathematics and Mathematical Sciences