@article{article8220cca3,
title   = {Determination of the normal spring stiffness coefficient in the linear spring-dashpot contact model of discrete element method},
author = {Navarro, Hélio Aparecido and Braun, Meire Pereira de Souza},
year = {2013},
doi = {10.1016/j.powtec.2013.05.049},
journal   = {Powder Technology}
}