@incollection{JEDP_1974____A4_0,
     author = {Mohamed Salah Baouendi and Johannes Sj\"ostrand},
     title = {R\'egularit\'e analytique pour des op\'erateurs elliptiques singuliers en un point},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {4},
     pages = {1--7},
     publisher = {\'Ecole polytechnique},
     year = {1974},
     language = {fr},
     url = {https://proceedings.centre-mersenne.org/item/JEDP_1974____A4_0/}
}