@article{ELA_2011__22__a12,
     author = {Armentia, Gorka and Gracia, Juan-Miguel and Velasco, Francisco E.},
     title = {Derivatives of the diameter and the area of a connected component of the pseudospectrum},
     journal = {The electronic journal of linear algebra},
     pages = {1004--1019},
     publisher = {mathdoc},
     volume = {22},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2011__22__a12/}
}