@incollection{JEDP_1990____A10_0,
     author = {Skibsted, Erik},
     title = {Time-dependent approach to radiation conditions},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {10},
     pages = {1--13},
     publisher = {Ecole polytechnique},
     year = {1990},
     mrnumber = {91k:81201},
     language = {en},
     url = {http://www.numdam.org/item/JEDP_1990____A10_0/}
}