Mulev, M., Grupče, L., Melovski, L., & Derlieva, L. (1994). Mineral matters content in the organs of the species Quercus frainetto and Quercus cerris in the ass. Quercetumfrainetto-cerris macedonicum Oberd. 1948, em. Horvat 1959 in „Galičica,, National Park. Macedonian Journal of Ecology and Environment, 2(1), 37–46. Retrieved from http://mjee.org.mk/index.php/mjee/article/view/14