Raffai, Peter, Ondřej Maršálek, a Gabriela Nečasová. 2017. „NUMERICAL MODELLING OF DRY FRICTION OF PISTON RINGS IN INTERNAL COMBUSTION ENGINES". Perner’s Contacts 12 (2):44-55. https://pernerscontacts.upce.cz/index.php/perner/article/view/468.