@article{CC_2008_37_4_a11,
     author = {Nazarov, Serguei A. and Soko{\l}owski, Jan},
     title = {Shape sensitivity analysis of eigenvalues revisited},
     journal = {Control and Cybernetics},
     pages = {999--1012},
     publisher = {mathdoc},
     volume = {37},
     number = {4},
     year = {2008},
     zbl = {1188.49044},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2008_37_4_a11/}
}