1. Cundall, P. A.: Distinct element models of soil and rock structure. In: Brown, E. T. (ed.): Analytical and computational methods in engineering rock mechanics, pp. 129?163. London: Allen & Unwin 1986
2. Cundall, P. A.; Strack, O. D. L.: A discrete numerical model for granular assemblies. Geotechnique 29 (1979) 47?65
3. Ting, J. M.; Corkum, B. T.; Greco, C.: Application of the distinct element method in geotechnical engineering. In: Pande, G. N.; v. Impe (eds.): Proc. 2nd Int. Conf. on Num. Models in Geomech., Gent, 1986, pp. 789?798. Rotterdam: Balkema
4. Williams, J. R.; Mustoe, G. G. W.: Modal methods for the analysis of discrete systems. Comput. Geotech. 4 (1987) 1?19
5. Toupin, R.: Elastic Materials with Couple-stresses. Arch. Ration Mech. Anal. 11 (1962) 385?414