Moreno, Gabriel, and Fernando Esteve Raventós. “Boletus Aemilii Barbier, B. Permagnificus Pöder and Xerocomus Truncatus Singer, Snell & Dick, in Spain”. Lazaroa, vol. 10, Jan. 1987, p. 253, https://revistas.ucm.es/index.php/LAZA/article/view/LAZA8788110253A.