@incollection{JEDP_2012____A7_0,
     author = {Mas, Albert},
     title = {Variational inequalities for singular integral operators},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {7},
     pages = {1--14},
     publisher = {Groupement de recherche 2434 du CNRS},
     year = {2012},
     doi = {10.5802/jedp.90},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/jedp.90/}
}