@article{ASNSP_1978_4_5_1_115_0,
     author = {Garnir, H. G. and L\'eonard, P.},
     title = {Extension d'un th\'eor\`eme de l. {G\r{a}rding} \`a certaines fonctions hyperboliques},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {115--129},
     publisher = {Scuola normale superiore},
     volume = {4e s{\'e}rie, 5},
     number = {1},
     year = {1978},
     mrnumber = {470503},
     zbl = {0373.35054},
     language = {fr},
     url = {http://www.numdam.org/item/ASNSP_1978_4_5_1_115_0/}
}