@article{JCA_1998_5_1_a11,
     author = {F. Oustry},
     title = {Vertical {Developments} of a {Convex} {Function}},
     journal = {Journal of convex analysis},
     pages = {153--17},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {1998},
     url = {http://geodesic.mathdoc.fr/item/JCA_1998_5_1_a11/}
}