TY JOUR TI STATIC CALCULATION OF FILM ROOF OF CULTIVATION STRUCTURE KW greenhouse KW membrane roof KW wind load KW method of membrane calculation JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Blazhnov, A.A. PY 2020 IS 5 PB Belgorod State Technological University named after V.G. Shukhov