Avdelas, G., A. Hadjidimos, and A. Yeyios. “Some Theoretical and Computational Results Concerning the Accelerated Overrelaxation (AOR) Method”. Anal. Numér. Théor. Approx., vol. 9, no. 1, Feb. 1980, pp. 5-10, https://ictp.acad.ro/jnaat/journal/article/view/1980-vol9-no1-art1.