Leonardi, S., M. Failla, G. Sciacca, and M. Rapp. “Above-Ground Biomass and Nutrients in a Turkey Oak (Quercus Cerris L.) Stand on Mount Etna”. Oecologia Montana, Vol. 8, no. 1-2, Dec. 1999, pp. 1-5, https://om.vuvb.uniza.sk/index.php/OM/article/view/107.