@article{RLIN_1994_9_5_3_a5,
     author = {Bressan, Aldo and Motta, Monica},
     title = {On control problems of minimum time for {Lagrangian} systems similar to a swing. {I.} {Convexity} criteria for sets},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni},
     pages = {247--254},
     publisher = {mathdoc},
     volume = {Ser. 9, 5},
     number = {3},
     year = {1994},
     zbl = {0814.70019},
     mrnumber = {934514},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RLIN_1994_9_5_3_a5/}
}