Vrublová, D., R. Kapica, B. Gibesová, and J. Mudruňka. “New Possibilities of Calculating the Volumes of Extracted Masses in the Surface Mining of Brown Coal”. GeoScience Engineering, vol. 63, no. 3, Oct. 2017, pp. 8-17, http://www.geoscience.cz/ojs/index.php/GSE/article/view/155.