@article{ASNSP_1968_3_22_1_67_0,
     author = {Sova, Miroslav},
     title = {Probl\`eme de {Cauchy} pour \'equations hyperboliques op\'erationnelles \`a coefficients constants non-born\'es},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {67--100},
     publisher = {Scuola normale superiore},
     volume = {3e s{\'e}rie, 22},
     number = {1},
     year = {1968},
     mrnumber = {232111},
     zbl = {0202.10902},
     language = {fr},
     url = {http://archive.numdam.org/item/ASNSP_1968_3_22_1_67_0/}
}