@incollection{JEDP_1987____A10_0, author = {Melrose, Richard B.}, 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}, mrnumber = {89b:58209}, zbl = {0656.35098}, language = {en}, url = {http://www.numdam.org/item/JEDP_1987____A10_0/} }