@incollection{JEDP_1994____A10_0,
     author = {Lindblad, Hans},
     title = {Counterexamples to local existence for nonlinear wave equations},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {10},
     pages = {1--5},
     publisher = {Ecole polytechnique},
     year = {1994},
     mrnumber = {95k:35136},
     zbl = {0877.35081},
     language = {en},
     url = {http://www.numdam.org/item/JEDP_1994____A10_0/}
}