@incollection{MSMF_1977__51-52__125_0,
     author = {M\'etivier, Guy},
     title = {Valeurs propres de probl\`emes aux limites elliptiques irr\'eguliers},
     booktitle = {Contributions \`a l'\'etude des op\'erateurs elliptiques et hypoelliptiques},
     series = {M\'emoires de la Soci\'et\'e Math\'ematique de France},
     pages = {125--219},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {51-52},
     year = {1977},
     doi = {10.24033/msmf.235},
     mrnumber = {57 #13244},
     zbl = {0401.35088},
     url = {http://www.numdam.org/articles/10.24033/msmf.235/}
}