BURZYŃSKI, Włodzimierz. Theoretical foundations of the hypotheses of material effort. Engineering Transactions, [S. l.], v. 56, n. 3, p. 269–305, 2014. DOI: 10.24423/ENGTRANS.199.2008. Disponível em: http://et.ippt.gov.pl/index.php/et/article/view/199. Acesso em: 17 jan. 2026.