@Misc{ CitPaoPis23, author = { Cito, Simone and Paoli, Gloria and Piscitelli, Gianpaolo }, title = { A stability result for the first Robin-Neumann eigenvalue: A double perturbation approach }, journal = { }, year = { 2023 }, pages = { }, URL = { http://cvgmt.sns.it/paper/5960/ }, note = { cvgmt preprint} }