. "THE EFFECT OF VACCINATION ON THE DYNAMICS OF CHILDHOOD DISEASES DESCRIBED BY A FRACTIONAL SIR EPIDEMIC MODEL S. Z. RIDA1, A. S. ABD EL RADI1, A.A.M. ARAFA1, AND M. KHALIL2", Journal of Fractional Calculus and Applications, 3, 2, 2013, 1-14. doi: 10.21608/jfca.2013.289950