1. Mitt. Forschung;Blasius;Ver. deut. Ing.,1913
2. A critical review of the literature on pressure drop in non circular ducts and annuli;Claiborne,1952
3. Fully developed pressure drop in triangular shaped ducts;Carlson;J. Heat Transfer,1961
4. Flow in corner of passages with non circular sections;Eckert;Trans Am. Soc. Mech. Engrs,1956
5. Untersuchungen uber die Geschwindigteitsverteilung in turbulenten Stromungen;Nikuradse;Thesis,1926