BORHANIFAR, Abdollah, and Sohrab VALIZADEH. 2013. “A Fractional Finite Difference Method for Solving the Fractional Poisson Equation Based on the Shifted Grünwald Estimate”. Walailak Journal of Science and Technology (WJST) 10 (5):427-35. https://wjst.wu.ac.th/index.php/wjst/article/view/280.