1. The Lemnaceae, or duckweeds: A review of the descriptive and experimental literature;Hillman;Bot. Rev.,1961
2. The uses of duckweed;Hillman;Am. Scient.,1978
3. Physiologische und okologische untersuchungen an Lemnaceae;Landolt;Berichte der Schweizerischen Bot. Ges,1957
4. Plant Growth and Development;Leopold,1975
5. Effect of harvest rate, waste loading, and stocking density on the yield of duckweeds;Said,1979