1. A remark on Ky Fan's minimax principle;Brézis;Boll. Unione Mat. Ital.,1972
2. A minimax inequality and applications;Ky,1972
3. On the regularization of monotone variational inequalities;Gwinner;Ops Res. Verf.,1978
4. On the penalty method for constrained variational inequalities;Gwinner,1981