ILJINS, U.; ZIEMELIS, I.; PUTĀNS, H.; ŠĶĒLE, A.; NAVICKAS, J. Optimization of the Parameters of Solar Water Heating System. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 353–358, 2006. DOI: 10.17770/etr2003vol1.1994. Disponível em: https://journals.ru.lv/index.php/ETR/article/view/1994.. Acesso em: 28 apr. 2024.