- Boundary Element Analysis of Contact Film Stiffness,
R.S. Hack and A.A. Becker
Paper 16 from CCP: 77, ISBN 0-948749-89-X (2003)
- Boundary Element Analysis of Rigid Body Contact,
R.S. Hack and A.A. Becker
Paper 11.1 from CCP: 59, ISBN 0-948749-61-X (1999)