TY JOUR TI Simple asymmetry indicators tested in natural even-aged Scots pine (Pinus sylvestris L.) stands in Bulgaria KW forest biometry KW diametric distributions KW Pinus sylvestris L. KW skewness KW height curves KW steepness JO Forestry Engineering Journal AU Petrin, R.D. PY 2023 IS 13 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov