@Misc{ CaMaDaPu18, author = { Catino, Giovanni and Dario D. Monticelli, and Mastrolia, Paolo and Punzo, Fabio }, title = { Four dimensional closed manifolds admit a weak harmonic Weyl metric }, journal = { }, year = { 2018 }, pages = { }, URL = { https://gecogedi.dimai.unifi.it/paper/520/ }, note = { cvgmt preprint} }