Churchill and Bernstein (1977)
Churchill, S.W., and Bernstein, M. (1977). A Correlating Equation for Forced Convection from Gases and Liquids to a Circular Cylinder in Cross Flow, J. Heat Transfer, 99, 300-306. in Bejan, Adrian; Kraus, Allan D. Heat Transfer Handbook. John Wiley & Sons. Online version available at:http://www.knovel.com/knovel2/Toc.jsp?BookID=725&VerticalID=0