1. Heat transfer and friction in tubes with repeated-rib roughness;Webb;Int. J. Heat Mass Transfer,1971
2. J. Nikuradse, Laws of flow in rough pipes, NACA TM-1292.
3. Heat and momentum transfer in smooth and rough tubes at various Prandtl numbers;Dipprey;Int. J. Heat Mass Transfer,1963
4. Ameloration du transfert de chaleur par l'emploi de surfaces corrugees, Commissariat a L'energy Atomique;Gargaud;Report CEA-R 2464,1964
5. Heat transfer and pressure drop in rough pipes;Nunner;VDI- Forsch.,1950