S. . Hristovski, L. Melovski, M. Šušlevska, and L. Grupče, “Belowground phytomass and production in the beech ecosystem Calamintho grandiflorae-Fagetum in Mavrovo National Park. V. Belowground production in the tree and shrub layers”, MJEE, vol. 12, no. 1-2, pp. 9–20, Dec. 2009.