Team, S. “Multistage Integral Mean Value Method for the Fredholm Integral Equations of the Second Kind: Ahmad Molabahrami, Sakineh Niasadegh”. Thai Journal of Mathematics, vol. 18, no. 2, June 2020, pp. 751–763, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/1032.