MACIEJEWSKI, J.; JARZĘBOWSKI, A.; TRĄMPCZYŃSKI, W. On the Efficiency of the Soil Digging Processes. Engineering Transactions, [S. l.], v. 49, n. 4, p. 599–621, 2015. DOI: 10.24423/engtrans.544.2001. Disponível em: https://et.ippt.pan.pl/index.php/et/article/view/544. Acesso em: 9 oct. 2025.