1. Über die Beruehrung fester, elastischer Körper;Hertz;J reine angew Math,1882
2. Sul contato di due corpo elastici;Cattaneo;Rend dell’Accad Nazl Lin,1938
3. Compliance of elastic bodies in contact;Mindlin;J Appl Mech,1949
4. Elastic spheres in contact under varying oblique forces;Mindlin;J Appl Mech,1953
5. A new principle in contact mechanics;Jäger;J Tribol,1998