THEODOROPOULOS, K., E. ELEFTHERIADOU, N. ATHANASIADIS, and I. TSIRIPIDIS. “PHYTOSOCIOLOGICAL RESEARCH OF THE PURE BETULA PENDULA FORESTS IN GREECE: RHODOPE MOUNTAIN RANGE (NE GREECE)”. Annali Di Botanica, vol. 3, June 2003, pp. 77-92, doi:10.4462/annbotrm-9197.