@article{JCA_2005_12_1_JCA_2005_12_1_a4,
     author = {R. Mifflin and C. Sagastizabal},
     title = {Relating {\protect\emph{U}-Lagrangians} to {Second-Order} {Epi-Derivatives} and {Proximal} {Tracks}},
     journal = {Journal of convex analysis},
     pages = {81--93},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {2005},
     url = {http://geodesic.mathdoc.fr/item/JCA_2005_12_1_JCA_2005_12_1_a4/}
}