@incollection{JEDP_1987____A10_0,
     author = {Richard B. Melrose},
     title = {Semilinear waves with cusp singularities},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {10},
     pages = {1--10},
     publisher = {\'Ecole polytechnique},
     year = {1987},
     zbl = {0656.35098},
     mrnumber = {89b:58209},
     language = {en},
     url = {https://proceedings.centre-mersenne.org/item/JEDP_1987____A10_0/}
}