1. Performance analysis of a full-scale duckweed-covered sewage lagoon;Alaerts;Wat. Res.,1996
2. Al-Nozaily F. and Alaerts G. J. Duckweed-covered Sewage Lagoon performance on domestic wastewater in Sana’a using Lemna gibba, in preparation
3. Standard Methods for the Examination of Water and Wastewater,1992
4. Wastewater Treatment and Disposal;Arceivala,1981
5. Nitrogen metabolism in plants;Beevers,1976