@Misc{ CatMasMon21, author = { Catino, Giovanni and Mastrolia, Paolo and Monticelli, Dario Daniele }, title = { Rigidity of Critical Metrics for Quadratic Curvature Functionals }, journal = { J. Math. Pures Appl. }, year = { 2022 }, pages = { }, URL = { http://cvgmt.sns.it/paper/5289/ }, note = { cvgmt preprint} }