@article{01534272,
title = {Harmonic sum and duality.},
journal = {Journal of Convex Analysis},
volume = {7},
year = {2000},
pages = {95-113},
zbl = {0964.49020},
language = {en},
url = {http://dml.mathdoc.fr/item/01534272}
}
Penot, Jean-Paul; Zălinescu, Constantin. Harmonic sum and duality.. Journal of Convex Analysis, Tome 7 (2000) pp. 95-113. http://gdmltest.u-ga.fr/item/01534272/