Wojtasik, Mieczysław, and Dawid Aleksander Szatten. “Wyznaczanie gęstości Naturalnej Gleb = Determination of Natural Bulk Density of Soils”. Journal of Education, Health and Sport 5, no. 3 (March 26, 2015): 218–228. Accessed July 19, 2024. https://apcz.umk.pl/JEHS/article/view/2594.