1. Proc. NSF-NASA Workshop on Wind Driven Generator Systems,1973
2. Energieumsetzungen in Venturidüsen;Betz;Naturwissenshaften,1929
3. A Preliminary Report on the Design and Performance of Ducted Windmills;Lilley,1956
4. Shrouded Aerogenerator Design Study I. Two dimensional shroud performance;Kogan;Bull. Res. Coun. Israel.,1962