TY JOUR TI IMPROVEMENT OF RIPPER WORKING BODIES PARAMETERS FOR DIGGING FROZEN SOIL OF ARCTIC AND THE NORTH OF WESTERN SIBERIA KW digger KW working body KW efficiency KW frozen ground KW performance JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Kuznecova, V.. PY 2016 IS 1 PB Belgorod State Technological University named after V.G. Shukhov