Klymenko, V.V., V.I. Kravchenko, M.V. Lychuk, and V.P. Soldatenko. “GROUND HEAT ACCUMULATOR WITH IMPROVED THERMAL CHARACTERISTICS”. Energy Technologies & Resource Saving, no. 1 (February 20, 2015): 51-58. Accessed August 20, 2022. https://etars-journal.org/index.php/journal/article/view/132.