@article{Matysko_2018, title={Ground as a source of heat for heat pumps}, volume={2}, url={https://jmee.tu.koszalin.pl/ojs/index.php/jmee/article/view/55}, DOI={10.30464/jmee.2018.2.2.131}, number={2}, journal={Journal of Mechanical and Energy Engineering}, author={Matysko, Robert}, year={2018}, month={Jul.}, pages={131-138}