1. Angermann, L., Wang, S.: Convergence of a fitted finite volume method for the penalized Black-Scholes equation governing European and American Option pricing. Numer. Math. 106, 1–40 (2007)
2. Chen, C.H., Mangasarian, O.L.: A class of smoothing functions for nonlinear and mixed complementarity problems. Comput. Optim. Appl. 5, 97–138 (1996)
3. Choe, H.J., Shim, Y.: Degenerate variational inequalities with gradient constraints. Annali della Scuola Normale Superiore di Pisa, Classes di Scienze 4e serie, 22, 25–53 (1995)
4. Damgaard, A.: Computation of reservation prices of options with proportional transaction costs. J. Econ. Dyn. Control 30, 415–444 (2006)
5. Daryina, A.N., Izmailov, A.F., Solodov, M.V.: A class of active-set Newton methods for mixed complementarity problems. SIAM J. Optim. 36, 409–429 (2004)