Ermal Feleqi, “Estimates for the deviation of solutions and eigenfunctions of second-order elliptic Dirichlet boundary value problems under domain perturbation”, Journal of Differential Equations, 260:4 (2016), 3448
Michael M. H. Pang, “Sharp bounds for domain perturbations of Dirichlet Laplacians defined on smooth domains”, Semigroup Forum, 90:1 (2015), 1
Julian Haddad, Marcos Montenegro, “On differentiability of eigenvalues of second order elliptic operators on non-smooth domains”, Journal of Differential Equations, 259:1 (2015), 408