@article{ASNSP_2006_5_5_4_439_0,
     author = {Yu, Yifeng},
     title = {A simple proof of the propagation of singularities for solutions of {Hamilton-Jacobi} equations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {439--444},
     publisher = {Scuola Normale Superiore, Pisa},
     volume = {Ser. 5, 5},
     number = {4},
     year = {2006},
     mrnumber = {2297718},
     zbl = {1150.35002},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_2006_5_5_4_439_0/}
}