@article{BSMF_1962__90__39_0,
     author = {Leray, Jean},
     title = {Un prolongement de la transformation de {Laplace} qui transforme la solution unitaire d'un op\'erateur hyperbolique en sa solution \'el\'ementaire. {(Probl\`eme} de {Cauchy.} {IV.)}},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {39--156},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {90},
     year = {1962},
     doi = {10.24033/bsmf.1576},
     mrnumber = {26 #1625},
     zbl = {0185.34302},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1576/}
}