1. New contact-definition algorithm using inscribed spheres for 3D discontinuous deformation analysis;Ahn;Int. J. Comput. Methods,2011
2. Ahn, T., Song, J., 2012. New contact resolution algorithm using two-stage contact definition and rounding scheme in 3D DDA. Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, pp. 101–106.
3. Ashayer, P. 2007. Application of rigid body impact mechanics and discrete element modeling to rockfall simulation, PhD Thesis. University of Toronto, p. 205.
4. An alternative scheme for the corner–corner contact in the two-dimensional discontinuous deformation analysis;Bao;Adv. Eng. Softw.,2010
5. Validation of dynamic block displacement analysis and modification of edge-to-edge contact constraints in 3-D DDA;Beyabanaki;Int. J. Rock Mech. Min. Sci.,2009