Paolillo, A.; Naldini, B.; Drovandi, F.; Longo, N.; Gonnelli, T. 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. 2002, 41, 212-219.