@incollection{JEDP_1975____263_0,
     author = {Pham The Lai},
     title = {Estimation du reste dans la th\'eorie spectrale d'une classe de probl\`emes d'op\'erateur elliptiques d\'eg\'en\'er\'es},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     pages = {263--277},
     publisher = {Ecole polytechnique},
     year = {1975},
     mrnumber = {487073},
     language = {fr},
     url = {http://archive.numdam.org/item/JEDP_1975____263_0/}
}