1. Austin, D.C., 2005. Patent: Tidal vertical flow wastewater treatment system and method. United States: US 6,896,805 B2.
2. Influence of cation exchange capacity (CEC) in a tidal flow, flood and drain wastewater treatment wetland;Austin;Ecol. Eng.,2006
3. Austin, D.C., Lohan, E., 2005. Patent: Integrated tidal wastewater treatment system and method. United States: US 6,881,338 B2.
4. Retention of E. coli in municipal sewage by means of planted soil filters in two-stage pilot plant systems;Baeder-Bederski;Water Sci. Technol.,2005
5. Behrends, L.L., 1999. Patent: Reciprocating subsurface flow constructed wetlands for improving wastewater treatment. United States: US 5,863,433.