@article{JCA_2000_7_1_JCA_2000_7_1_a4,
     author = {J.-P. Penot and C. Zalinescu},
     title = {Harmonic {Sum} and {Duality}},
     journal = {Journal of convex analysis},
     pages = {95--114},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {2000},
     url = {http://geodesic.mathdoc.fr/item/JCA_2000_7_1_JCA_2000_7_1_a4/}
}