@incollection{JEDP_1992____A21_0,
     author = {Lebeau, Gilles},
     title = {Control for hyperbolic equations},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {21},
     pages = {1--24},
     publisher = {Ecole polytechnique},
     year = {1992},
     zbl = {0779.35005},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1992____A21_0/}
}