KUMAR, S., N. FARAZ, and K. SAYEVAND. “A Fractional Model of Bloch Equation in Nuclear Magnetic Resonance and Its Analytic Approximate Solution”. Walailak Journal of Science and Technology (WJST), vol. 11, no. 4, Oct. 2013, pp. 273-85, https://wjst.wu.ac.th/index.php/wjst/article/view/519.