1. W. Abbott and K. Schreiber: Proc. Holm Conf. on 'Electrical contacts', Chicago, IL, USA, September 1981, IEEE, 211–219.
2. F. Hiibner-Obenland and J. Minuth: Proc. 45th IEEE Holm Conf. on 'Electrical contacts', Pittsburgh, PA, USA, October 1999, IEEE, 193–202.
3. C. Maul: 'Intermittent electrical discontinuities in automotive electrical contacts', PhD thesis, University of Southampton, Southampton, UK, 2001, 210.
4. C. Maul, J. McBride and J. Swingler: Proc. Int. Conf. on 'Electrical contacts', Chicago, IL, USA, September 2000, IEEE, 23–28.