1. I. V. Beiko, B. N. Bublik, and P. N. Zin’ko, Methods and Algorithms for the Solution of the Problems of Optimization [in Russian], Vyshcha Shkola, Kiev (1983).
2. I. Glavacek, J. Gaslinger, I. Nechas, and J. Lovicek, Solution of Variational Inequalities in Mechanics [Russian translation], Mir, Moscow (1986).
3. R. Glowinski, J.-L. Lions, and R. Trémolières, Numerical Analysis of Variational Inequalities, North-Holland, Amsterdam–New York–Oxford (1981).
4. A. S. Kravchuk, Variational and Quasivariational Inequalities in Mechanics [in Russian], Moscow State Academy of Instrument-Making and Automatics, Moscow (1997).
5. A. S. Kravchuk, “The variational method in contact problems. The present state of the problem and trends in its development,” Prikl. Mat. Mekh., 73, No. 3, 492–502 (2009); English translation: J. Appl. Math. Mech., 73, No. 3, 351–357 (2009).