TY JOUR TI DEVELOPMENT OF THE PROGRAM COMPLEX OF CALCULATION OF GAS PIPES OF NATURAL GAS AND BIOGAS KW JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Suslov, D.Y. AU Temnikov, D.O. AU Suslov, D.I. PY 2019 IS 4 PB Belgorod State Technological University named after V.G. Shukhov