@article{JCA_2002_9_2_JCA_2002_9_2_a4,
     author = {M. Ciligot-Travain and S. Traore},
     title = {On {Subgradients} of {Spectral} {Functions}},
     journal = {Journal of convex analysis},
     pages = {401--414},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {2002},
     url = {http://geodesic.mathdoc.fr/item/JCA_2002_9_2_JCA_2002_9_2_a4/}
}