@article{ASNSP_1988_4_15_1_1_0,
     author = {Wang, Xue Ping},
     title = {Time-delay operators in semiclassical limit, finite range potentials},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {1--34},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 15},
     number = {1},
     year = {1988},
     mrnumber = {1001028},
     zbl = {0706.35110},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1988_4_15_1_1_0/}
}