@incollection{JEDP_2004____A9_0,
     author = {Sj\"ostrand, Johannes},
     title = {The {Calder\'on} problem with partial data},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {9},
     pages = {1--9},
     publisher = {Groupement de recherche 2434 du CNRS},
     year = {2004},
     doi = {10.5802/jedp.9},
     mrnumber = {2135364},
     zbl = {1152.35518},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/jedp.9/}
}