KOVÁČIK, J. - BIELEK, Jozef - EMMER, Štefan. Cu-graphite composites: composition dependence of friction coefficient. In Friction, Wear and Wear Protection : International symposium. Aachen, Germany, 9.-11.4. 2008. Weinheim : Wiley-VCH, 2009, s.67-73. ISBN 978-3-527-32366-1. E*, *820/02/2009