Lyalko, V., Elistratova, L. and Аpostolov A. 2017. The estimation of cultivated areas under winter crops by Landsat survey data over the Donetsk region . Reports of the National Academy of Sciences of Ukraine. 6 (Jun. 2017), 51–57. DOI:https://doi.org/10.15407/dopovidi2017.06.051.