@Article{ BouFraLuc16, author = { Bouchitté, Guy and Fragalà, Ilaria and Lucardesi, Ilaria }, title = { A variational method for second order shape derivatives }, journal = { SIAM J. Control Optim. }, year = { 2016 }, doi = { 10.1137/15100494X }, volume = { 54 }, number = { 2 }, pages = { 1056–1084 }, URL = { http://cvgmt.sns.it/paper/4002/ }, note = { cvgmt preprint} }