Karalevich, U.V. and Medvedev, D.G. 2020. The influence of the length of heat sources on the external border on the temperature distribution in profiled polar-orthotropic ring plates taking into account there heat exchange with the external environment. Journal of the Belarusian State University. Mathematics and Informatics. 3 (Dec. 2020), 86–91. DOI:https://doi.org/10.33581/2520-6508-2020-3-86-91.