Кумратова, А. М., В. И. Тинякова, and Н. В. Третьякова. “A Comparative Analysis of the Forecast Yield for Farming Zones Varying Degrees of Risk”. Modern Economics: Problems and Solutions, Vol. 12, Apr. 2015, pp. 111-7, https://journals.vsu.ru/meps/article/view/8308.