@article{JEDP_1997____A10_0,
     author = {Klainerman, S. and Machedon, Matei},
     title = {On the regularity properties of non-linear wave equations},
     journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {10},
     pages = {1--8},
     publisher = {Ecole polytechnique},
     year = {1997},
     language = {en},
     url = {http://www.numdam.org/item/JEDP_1997____A10_0/}
}