@incollection{JEDP_1987____A9_0, author = {G\'erard, Patrick}, title = {R\'egularit\'e de moyennes de solutions d'\'equations aux d\'eriv\'ees partielles}, booktitle = {}, series = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, eid = {9}, pages = {1--8}, publisher = {Ecole polytechnique}, year = {1987}, zbl = {0639.35010}, language = {fr}, url = {http://archive.numdam.org/item/JEDP_1987____A9_0/} }