@incollection{MSMF_1977__51-52__63_0, author = {Helffer, Bernard}, title = {Construction de param\'etrixes pour des op\'erateurs pseudodiff\'erentiels caract\'eristiques sur la r\'eunion de deux c\^ones liss\'es}, booktitle = {Contributions \`a l'\'etude des op\'erateurs elliptiques et hypoelliptiques}, author = {Collectif}, series = {M\'emoires de la Soci\'et\'e Math\'ematique de France}, pages = {63--123}, publisher = {Soci\'et\'e math\'ematique de France}, number = {51-52}, year = {1977}, doi = {10.24033/msmf.234}, zbl = {0374.35042}, mrnumber = {57 #856}, url = {http://archive.numdam.org/articles/10.24033/msmf.234/} }