1. Arakelyan, A.: A finite difference method for two-phase parabolic obstacle-like problem. Armen. J. Math. 7(1), 32–49 (2015)
2. Arakelyan, A.G., Barkhudaryan, R.H., Poghosyan, M.P.: Finite difference scheme for two-phase obstacle problem. Dokl. Nats. Akad. Nauk Armen. 111(3), 224–231 (2011)
3. Arakelyan, A., Barkhudaryan, R., Poghosyan, M.: An error estimate for the finite difference scheme for one-phase obstacle problem. J. Contemp. Math. Anal. 46(3), 131–141 (2011)
4. Arakelyan, A., Barkhudaryan, R., Poghosyan, M.: Numerical solution of the two-phase obstacle problem by finite difference method. Armen. J. Math. 7(2), 164–182 (2015)
5. Barkhudaryan, R., Juráš, M., Salehi, M.: Iterative scheme for an elliptic non-local free boundary problem. Appl. Anal. 95(12), 2794–2806 (2016)