frictional contact problem” (with F.M.F. Simões, F. Gastaldi, M.D.P. Monteiro Marques), Int. J. Engng. Sci., 33, pp. 1959–1986, 1995. “Oscillations of bridge stay-cables induced by periodic motions of the deck and/or the towers” (with A. Pinto da Costa, F. Branco, J.L. Lilien), ASCE Journal of Engineering Mechanics, 122, pp. 613–622, 1996. “A finite element analysis of non-prescribed crack propagation in concrete” (with J. Alfaiate, E.B. Pires), Computers & Structures, 63, pp. 17–26, 1997. “Growth and decay of acceleration waves in non-associative elastic-plastic fluid-saturated porous media” (with B. Loret, F.M.F. Simões), Int. J. Solids Structures, 34, pp. 1583–1608, 1997. “Instability and ill-posedness in some friction problems” (with F.M.F. Simões), Int. J. Engng. Sci., 36, pp. 1265–1293, 1998. “Mathematical analysis of a two degree-of-freedom frictional contact problem with discontinuous solutions” (with F. Gastaldi, M.D.P.Monteiro Marques), Mathl. Comput. Modelling, 28, pp. 247–261, 1998. “A numerical model for the passive and active behavior of skeletal muscles” (with E.B. Pires, L.R. Salvado, P.B. Dinis), Comp. Methods Appl. Mechs. Engrg., 151, pp. 419–433, 1998. “Surface instabilities in a Mooney-Rivlin body with frictional boundary conditions” (with T. Desoyer), International Journal of Adhesion and Adhesives, 18, pp. 413–419, 1998. “Instabilities in elastic-plastic fluid-saturated porous media: harmonic wave versus acceleration wave analyses” (with F.M.F. Simões, B. Loret), Int. J. Solids Structures, 36, pp. 1277–1295, 1999. “Dynamic stability of finite dimensional linearly elastic systems with unilateral contact and Coulomb friction” (with S. Barbarin, M. Raous, A. Pinto da Costa), Comp. Methods Appl. Mechs. Engrg., 177, pp. 289–328, 1999. “Preface” (with Anders Klarbring), Comp. Methods Appl. Mechs. Engrg., special issue on Computational Modeling of Contact and Friction, 177, pp. 163–165, 1999. “Friction and instability of steady sliding: squeal of a rubber / glass contact” (with D. Vola, M. Raous), Int. J. Num. Meth. Engng., pp. 1699–1720, 1999. “Stability of finite-dimensional nonlinear elastic systems with unilateral contact and friction” (with A. Pinto da Costa), Int. J. Solids Structures, 37, pp. 2519–2564, 2000. “The evolution and rate problems and the computation of all possible evolutions in quasi-static frictional contact” (with A. Pinto da Costa), Comput. Methods Appl. Mech. Engrg., 192, pp. 2791–2821, 2003. “A numerical study on multiple rate solutions and onset of directional instability in quasi-static frictional contact problems” (with A. Pinto da Costa), Computers & Structures, 82, pp. 1485–1494, 2004 “The directional instability problem in systems with frictional contacts” (with A. Pinto da Costa, I.N. Figueiredo, J.J. Júdice), Comput. Methods Appl.