Convex Programming with Separable Ellipsoidal Constraints: Application in Contact Problems with Orthotropic Friction
R. Kucera, J. Haslinger, T. Kozubek

On Forces and Accelerations in the Non-smooth Contact Dynamics Method
J. Kleinert, M. Obermayr

A Discrete Element Method for Assessing Reaction Forces in Excavation Tools
M. Obermayr, C. Vrettos, J. Kleinert, P. Eberhard

Rigid Body Dynamics with Moving Internal Masses on a Rough Surface
A.V. Sakharov

Formulación de Elementos de Contorno para la Resolución de Problemas de Contacto Anisótropo
L. Rodríguez-Tembleque, R. Abascal