Microscopic and macroscopic analysis of granular material behaviour in 3d flat-bottomed hopper by the discrete element method. Archives of Mechanics, [S. l.], v. 59, n. 3, p. 231–257, 2007. Disponível em: https://am3.ippt.pan.pl/index.php/am/article/view/v59p231. Acesso em: 13 may. 2025.