1. L. E. Andersson, A quasistatic frictional problem with normal compliance, Nonlin. Anal. TMA 16(4) (1991), 347–370.
2. Kevin T. Andrews, M. Shillor, and S. Wright, On the dynamic vibrations of an elastic beam in frictional contact with a rigid obstacle, preprint.
3. G. Bonfanti, A noncoercive friction problem with tangential applied forces in three dimensions, BUMI 7 (1993), 149–165.
4. A. Curnier, A theory of friction, Int. J. Solids Structures 20 (1984), no. 7, 637–647.
5. G. Duvuat and J. L. Lions, Inequalities in Mechanics and Physics, Springer-Verlag, Berlin, 1976.