@article{JCA_2002_9_1_JCA_2002_9_1_a15,
     author = {T. Diagana},
     title = {Variational {Sum} and {Kato's} {Conjecture}},
     journal = {Journal of convex analysis},
     pages = {291--294},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {2002},
     url = {http://geodesic.mathdoc.fr/item/JCA_2002_9_1_JCA_2002_9_1_a15/}
}