1. E. R. G. Eckert and E. Soehngen , Studies on Heat Transfer in Laminar Free Convection with Zehnder-Mach Interferometer , USAF Technical Report No. 5747 , 1948 .
2. E. R. G. Eckert and R. M. Drake , Jr.Analysis of Heat and Mass Transfer, chap. 12 , 532 pp. McGraw-Hill , New York , 1972 .