@article{PORMA_1990__47_2_115706,
     author = {Le\'on, Manuel de and Rodrigues, Paulo R.},
     title = {Almost contact structures and time-dependent {Lagrangians}},
     journal = {Portugaliae mathematica},
     pages = {115--130},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1990},
     mrnumber = {1090064},
     zbl = {0757.53016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1990__47_2_115706/}
}