Methodology of grain heap quantity and structure determination and economic evaluation of harvester-thresher cleaning enhancementEvgenia Muratova, Denis Muratov, Elena Makarenko, Sergey Shepelev, Olga Korobeynikova, Valeriia Chegge and Yana KabanovaE3S Web Conf., 175 (2020) 01009DOI: https://doi.org/10.1051/e3sconf/202017501009