A. Paolillo, B. Naldini, F. Drovandi, N. Longo, and T. Gonnelli, “Signs of resistance to Melampsora larici-tremulae on species of Pinus hosts of Melampsora pinitorqua: implications regarding the taxonomic relationship between the two rust fungi”, Phytopathol. Mediterr., vol. 41, no. 3, pp. 212–219, Dec. 2002.