Kravchenko, N., Butenko, J., Kienko, Z. and Sobran, V. (2020) “Reaction of very early and early mature varieties of potatoes to the external conditions of the north-eastern Forest-Steppe of Ukraine by productivity”, Bulletin of Sumy National Agrarian University. The series: Agronomy and Biology, 41(3), pp. 3-7. doi: 10.32782/agrobio.2020.3.1.