TY JOUR TI About fractional powers of a class of integral operators KW strongly continuous group,integral operator,fractional powers of operator. JO Actual directions of scientific researches of the XXI century: theory and practice AU Kostin, V.. AU Gim, M.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov