@article{SJL_1964-1965___3_1_0,
     author = {Segal, I.},
     title = {La vari\'et\'e des solutions d'une \'equation hyperbolique, non lin\'eaire d'ordre 2},
     journal = {S\'eminaire sur les \'equations aux d\'eriv\'ees partielles},
     pages = {1--80},
     year = {1964-1965},
     publisher = {Coll\`ege de France},
     number = {3},
     language = {fr},
     url = {https://www.numdam.org/item/SJL_1964-1965___3_1_0/}
}