Marketing and innovative aspects of the research of the competitiveness of countries in the grain market (for example, wheat)Ilkhom Umarov, Nursultan Shurenov, Zhanna Kozhamkulova and Kyz-Zhibek AbishevaE3S Web Conf., 159 (2020) 04003DOI: https://doi.org/10.1051/e3sconf/202015904003