TY JOUR TI THEORETICAL FUNDAMENTALS OF THE TREE FELLING BY MACHINES EQUIPPED WITH FLEXIBLE SAW CHAINS KW tree fall at felling KW flexible saw chains KW multi-dimensional space KW actual and geometric falling plane JO Bulletin of KSAU AU Kozinov, G.L. AU Danilov, A.G. AU Mirgunova, V.G. AU Starostin, G.I. AU Yenaleeva-Bandura, I.M. PY 2013 IS PB Krasnoyarsk State Agrarian University