@incollection{JEDP_1974____A2_0,
     author = {Dominique Pr\'evosto and Jacques Rolland},
     title = {Th\'eor\`eme d'indice et r\'egularit\'e pour une classe d'op\'erateurs elliptiques et d\'eg\'en\'er\'es},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {2},
     pages = {1--36},
     publisher = {\'Ecole polytechnique},
     year = {1974},
     mrnumber = {51 #8631},
     language = {fr},
     url = {https://proceedings.centre-mersenne.org/item/JEDP_1974____A2_0/}
}