. "A GENERALIZED ALGORITHM BASED ON LEGENDRE POLYNOMIALS FOR NUMERICAL SOLUTIONS OF COUPLED SYSTEM OF FRACTIONAL ORDER DIFFERENTIAL EQUATIONS H. KHALIL, R. A. KHAN, M. AL. SMADI, A. FREIHAT". Journal of Fractional Calculus and Applications, 6, 2, 2015, 123-143. doi: 10.21608/jfca.2015.306027