@article{AIHPC_2017__34_4_793_0,
     author = {Zhang, Pengfei},
     title = {Convex billiards on convex spheres},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {793--816},
     publisher = {Elsevier},
     volume = {34},
     number = {4},
     year = {2017},
     doi = {10.1016/j.anihpc.2016.07.001},
     mrnumber = {3661861},
     zbl = {1377.37058},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1016/j.anihpc.2016.07.001/}
}