https://atozmath.com/CONM/GaussEli.aspx?q=GS2

https://onlinemschool.com/math/assistance/equation/gaus/

https://www.codesansar.com/numerical-methods/gauss-seidel-iteration-using-c-programming.htm

https://matrixcalc.org/en/slu.html

https://www.easycalculation.com/algebra/sor-method.php

https://labmathdu.wordpress.com/successive-over-relaxation-method/

https://www.slideshare.net/maimustafa566/page-rank-algorithm-33212250