@incollection{JEDP_1990____A5_0,
     author = {Petkov, Vesselin M.},
     title = {Phase de diffusion pour des perturbations captives},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {5},
     pages = {1--10},
     publisher = {Ecole polytechnique},
     year = {1990},
     mrnumber = {92e:35121},
     zbl = {0718.35007},
     language = {fr},
     url = {http://archive.numdam.org/item/JEDP_1990____A5_0/}
}