@article{10_4171_ifb_347,
     author = {Julio D. Rossi and Eduardo V. Teixeira and Jos\'e Miguel Urbano},
     title = {Optimal regularity at the free boundary for the infinity obstacle problem},
     journal = {Interfaces and free boundaries},
     pages = {381--398},
     year = {2015},
     volume = {17},
     number = {3},
     doi = {10.4171/ifb/347},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ifb/347/}
}