@article{LJM_2006_23_a4,
     author = {O. Krupkov\'a and P. Voln\'y},
     title = {Differential equations with constraints in jet bundles: {Lagrangian} and {Hamiltonian} systems},
     journal = {Lobachevskii journal of mathematics},
     pages = {95--150},
     publisher = {mathdoc},
     volume = {23},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/LJM_2006_23_a4/}
}