1. Method and Apparatus for Pressurizing and Depressurizing of Fluids;Cheng,1970
2. Pressure Exchanger for Liquids;Hauge,1989
3. Pressure Exchanger Having a Rotor with Automatic Axial Alignment;Hauge,1999
4. Apparatus Effecting Pressure Exchange;Jendrassik,1954
5. Reverse Osmosis Apparatus and Method Incorporating External Fluid Exchange;Keefer,1984