Models of the optimal distribution of fertilizers and vehicles in grain productionAbdizhapar Saparbayev, Aiymzhan Makulova, Azamat Eleusov, Ulzhan Meirmanova and Zaure KlyshbayevaE3S Web Conf., 280 (2021) 06002DOI: https://doi.org/10.1051/e3sconf/202128006002