1. Aerodynamic model tests on butterfly valves;Keller;Escher-Wyss News,1936
2. Flow phenomena in hydraulic butterfly valves subjected to cavitation;Bleuler;Escher-Wyss News,1939
3. Performance analysis of butterfly valves;Cohn;Instruments,1951
4. Torque and cavitation characteristics of butterfly valves;Sarpkaya;ASME Journal of Applied Mechanics,1961
5. Low-torque butterfly valve design;Boger;Instrumentation Technology,1970