1. Approximation of the one-dimensional bounce problem;Buttazzo;Ricerche Mat.,1981
2. On the approximation of the elastic bounce problem on Riemannian manifolds;Buttazzo;J. Differential Equations,1983
3. The one-dimensional rebound problem and its approximations with nonconvex penalties;Carriero;Rend. Mat. (6),1981
4. On the realization of unilateral constraints;Deryabin;Prikl. Mat. Mekh.,1994
5. On the theory of systems with unilateral constraints;Deryabin;Prikl. Mat. Mekh.,1995