1. Bertram Ross, “The development of fractional calculus 1695-1900”, Historia Mathematica vol. 4, pp. 75–89, 1977.
2. Letter from Hanover, Germany to G.F.A. L’Hospital, September 30, 1695 Mathematische Schriften 1849, 2, Olms Verlag, Hildesheim, Germany (1695), pp. 301–302 reprinted 1962.
3. Keith B. Oldhamm, and Jerome Spainer, “The Fractional Calculus: Theory and applications of Differentiation and Integration to Arbitary Order”, Dover, 1974.
4. Pierre Simon de Laplace, “Théorie analytique des probabilités”, Vol. 7. Courcier, 1820.
5. Silvestre Francois Lacroix, “Traité du calcul differentiel et du calcul intégral”, Vol. 1. JBM Duprat, 1797.