@article{BSMF_1975__103__21_0,
     author = {Durand, Marc},
     title = {Param\'etrix d{\textquoteright}op\'erateurs elliptiques de classe $C^\mu $},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {21--63},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {103},
     year = {1975},
     doi = {10.24033/bsmf.1792},
     mrnumber = {52 #15113},
     zbl = {0327.58011},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1792/}
}