@article{AIHPC_1988__5_3_211_0,
     author = {Toland, J. F.},
     title = {Periodic solutions for a class of {Lorenz-lagrangian} systems},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {211--220},
     publisher = {Gauthier-Villars},
     volume = {5},
     number = {3},
     year = {1988},
     mrnumber = {954471},
     zbl = {0657.34042},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1988__5_3_211_0/}
}