@article{MTA_2019_4_2_a6,
     author = {E.N.Barron},
     title = {Lax formula for obstacle problems},
     journal = {Minimax theory and its applications},
     year = {2019},
     volume = {4},
     number = {2},
     zbl = {1428.35069},
     url = {http://geodesic.mathdoc.fr/item/MTA_2019_4_2_a6/}
}