PERONI, A.; PERONI, G.; MIFSUD, S. "Polypodium vulgare" subsp. "melitense" new subspecies from Gozo, Maltese Islands (Pteridophyta: "Polypodiaceae"). Botanica Complutensis, v. 37, p. 41–46, 22 May2013 https://doi.org/10.5209/rev_BOCM.2013.v37.42267.