“…The rolling contact formulation is based on Kalker's one, which is collected on his book (Kalker, 1990) or in Johnson's book (Johnson, 1985). This formulation it has been applied on 2D and 3D problems, using the BEM, by González and Abascal (1998), González and Abascal (2000), González and Abascal (2002), Abascal and Rodríguez-Tembleque (2007) and Rodríguez-Tembleque and Abascal (2010), allowing to consider real solid geometries (not only half-spaces) and unstructured meshes. Furthermore, there is a normal and tangential cross-influence relation.…”