LAMMERING, R.; PLENGE, M. Investigations on Railway Tracks with Special Emphasis on Partially Unsupported Sleepers Due to Voids. Engineering Transactions, [S. l.], v. 48, n. 3, p. 293–307, 2015. DOI: 10.24423/engtrans.594.2000. Disponível em: https://et3.ippt.pan.pl/index.php/et/article/view/594. Acesso em: 24 apr. 2025.