@article{JEDP_1999____A20_0,
     author = {Klainerman, Sergi\`u and Foschi, Damiano},
     title = {On bilinear estimates for wave equations},
     journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {20},
     pages = {1--17},
     publisher = {Universit\'e de Nantes},
     year = {1999},
     zbl = {01810593},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1999____A20_0/}
}