@article{10_4153_CJM_2004_037_x,
     author = {Penot, Jean-Paul},
     title = {Differentiability {Properties} of {Optimal} {Value} {Functions}},
     journal = {Canadian journal of mathematics},
     pages = {825--842},
     year = {2004},
     volume = {56},
     number = {4},
     doi = {10.4153/CJM-2004-037-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2004-037-x/}
}