W. Goujavin, F. Bauer, and W. Haas. Society of Tribologists & Lubrication Engineers annual meeting and exhibition 2012, page 334-337. Curran, (2012)452.
G. Baitinger, and W. Haas. Proceedings of the 15th International Sealing Conference (ISC), page 97-108. Ebelsbach, Leithner Media Production, (2008)344.