@article{CC_2003_32_4_a1,
     author = {Penot, Jean-Paul},
     title = {Rotundity, smoothness and duality},
     journal = {Control and Cybernetics},
     pages = {711--733},
     year = {2003},
     volume = {32},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2003_32_4_a1/}
}