@incollection{JEDP_1978____A14_0,
     author = {Gerd Grubb},
     title = {Sur la th\'eorie spectrale des probl\`emes aux limites pseudo-diff\'erentiels elliptiques},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {14},
     pages = {1--2},
     publisher = {\'Ecole polytechnique},
     year = {1978},
     language = {fr},
     url = {https://proceedings.centre-mersenne.org/item/JEDP_1978____A14_0/}
}