@article{TSG_1988-1989__7__25_0,
     author = {G\'erard, Christian},
     title = {Th\'eorie des r\'esonances pour des op\'erateurs de {Schr\"odinger} p\'eriodiques},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {25--30},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {7},
     year = {1988-1989},
     mrnumber = {1046265},
     zbl = {0715.47005},
     language = {fr},
     url = {http://www.numdam.org/item/TSG_1988-1989__7__25_0/}
}