00550naa#a2200181#i#450# EN\INFRA-M\bibl\28046 20241203150447.2 2308-4898 20190408b2019####ek#y0engy0150####ca RUS RU Discrete Geometric Models for Estimating the Degree of Shading in Solar Energy Journal article Moscow INFRA-M Academic Publishing LLC. 2019 17 с. Journal article local Математика. 51 RUS Markin Leonid V. zh-szf.ru