Plubtieng, S. and Sriprad, W. 2011. EXISTENCE AND APPROXIMATION OF SOLUTION OF THE VARIATIONAL INEQUALITY PROBLEM WITH A SKEW MONOTONE OPERATOR DEFINED ON THE DUAL SPACES OF BANACH SPACES. Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO). 1, 1 (Dec. 2011), 23–33.