2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/121218We obtain integral boundary decay estimates for solutions of fourth-order elliptic equations on a bounded domain with regular boundary. We apply these estimates to obtain stability bounds for the corresponding eigenvalues under small perturbations of the boundary.19 pages. Minor corrections. To appear in Ark. MatSpectral TheoryAnalysis of PDEs35J40; 35P15text