Methods of Freeze Protection for Fruit Trees by Means of Renewable Energy SourcesR. A. Kasymbekov, N. Y. Temirbaeva, S. O. Nazarov, Y. Zh. Osmonov and Nurzhan MuratE3S Web Conf., 288 (2021) 01001DOI: https://doi.org/10.1051/e3sconf/202128801001