@incollection{JEDP_2004____A4_0,
     author = {Castella, Fran\c{c}ois},
     title = {The radiation condition at infinity for the high-frequency {Helmholtz} equation with source term: a wave packet approach},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {4},
     pages = {1--18},
     publisher = {Groupement de recherche 2434 du CNRS},
     year = {2004},
     doi = {10.5802/jedp.4},
     zbl = {02161530},
     mrnumber = {2135359},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/jedp.4/}
}