@article{10_4171_ifb_380,
     author = {Mohammad Safdari},
     title = {On the shape of the free boundary of variational inequalities with gradient constraints},
     journal = {Interfaces and free boundaries},
     pages = {183--200},
     year = {2017},
     volume = {19},
     number = {2},
     doi = {10.4171/ifb/380},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ifb/380/}
}