Finite Difference Methods. Theory and Applications 7th International Conference, FDM 2018, Lozenetz, Bulgaria, June 11-16, 2018, Revised Selected Papers - Dimov, Ivan; Dimov, Ivan; Faragó, István; Faragó, István; Vulkov, Lubin; Vulkov, Lubin (Springer International Publishing : Imprint: Springer, 2019)