Radžiūnas, M., and F. Ivanauskas. “The Stability Conditions of Finite Difference Schemes for schrödinger, Kuramoto‐Tszuki and Heat Equations”. Mathematical Modelling and Analysis, vol. 3, no. 1, Dec. 1998, pp. 177-94, doi:10.3846/13926292.1998.9637101.