TY JOUR TI THE ABSORPTION SPECTRA AND THE CHEMICAL COMPOSITION OF THE PEAT HUMIC ACIDS IN KHANTY-MANSI AUTONOMOUS OKRUG - YUGRA KW humic acids KW hymatomelanic acids KW peat JO Bulletin of KSAU AU Rybachuk, O.V. AU Osnitskiy, E.M. AU Sartakov, M.P. PY 2015 IS PB Krasnoyarsk State Agrarian University