1. A remark on Ky Fan's minimax principle;Brézis;Bolletino U.M.I.,1972
2. A minimax inequality and applications;Fan,1972
3. A class of contact and friction dynamic problems in thermoelasticity and in viscoelasticity;Figueiredo;Int. J. Engng Sci.,1995
4. Dynamic contact problems with friction in linear viscoelasticity;Jarušek;C. R. Acad. Sci. Paris 322 Série A,1996