Baitelenova, A., Kurbanbayev, A., Stybayev, G., Yancheva, H., Serekpayev, N., Mukhanov, N., & Amantaev, B. (2021). Photosynthetic potential and productivity of annual mixed crops in Northern Kazakhstan. Bulgarian Journal of Agricultural Science, 27(Supplement 1), 85-94. https://agriacad.eu/ojs/index.php/bjas/article/view/2167