[1]
Ljubenova, M. 1994. Above-ground energy reserves and annual accumulation of energy in shrub and herb layers in ass. Quercus frainetto+Quercus cerris - Festuca heterophylla+Poa nemoralis in the Vakarel mountains. Macedonian Journal of Ecology and Environment. 2, 1 (Aug. 1994), 29–35.