@incollection{JEDP_1975____311_0, author = {Rolland, Jacques}, title = {Th\'eor\`eme d'indice pour une classe d'op\'erateurs elliptiques fortement d\'eg\'en\'er\'es sur la fronti\`ere}, booktitle = {}, series = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, pages = {311--340}, publisher = {Ecole polytechnique}, year = {1975}, mrnumber = {58 #11888}, language = {fr}, url = {http://archive.numdam.org/item/JEDP_1975____311_0/} }