@incollection{JEDP_1980____A7_0, author = {Gu, Chaohao}, title = {On the mixed partial differential equations in n independent variables}, booktitle = {}, series = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, eid = {7}, pages = {1--2}, publisher = {Ecole polytechnique}, year = {1980}, language = {en}, url = {http://www.numdam.org/item/JEDP_1980____A7_0/} }