@article{DMTCS_1997_1_a7,
     author = {Dragt, Alex J.},
     title = {A {Lie} connection between {Hamiltonian} and {Lagrangian} optics},
     journal = {Discrete mathematics & theoretical computer science},
     publisher = {mathdoc},
     volume = {1},
     year = {1997},
     doi = {10.46298/dmtcs.238},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.238/}
}