@incollection{JEDP_2018____A2_0,
     author = {Figalli, Alessio},
     title = {Free boundary regularity in obstacle problems},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     note = {talk:2},
     pages = {1--24},
     publisher = {Groupement de recherche 2434 du CNRS},
     year = {2018},
     doi = {10.5802/jedp.662},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/jedp.662/}
}