1. Brandt, K. - 1898 - Beiträge zur Kenntniss der chemischen Zusammensetzung des Planktons. Wiss. Meeresuntersuch. Ab. Kiel N.F. 3: 43?90.
2. Brige, E. A. & Juday, C. - 1922 - The inland lakes of Wisconsin. The plankton. I. Its quantity and chemical composition. Wisconsin Geol. Nat. Hist. Surv. Bull. 64 Sci. Ser. No. 13: 1?222.
3. Clark, R. B. - 1966 - A practical course in experimental zoology, John Wiley and sons. Ltd., London, 206 pp.
4. Cowgill, R. W. & Pardee, A. B. - 1957 - Experiments in biochemical research techniques, John Wiley and Sons. Inc., London, 189 pp.
5. Dubois, M., Gills, K. A., Hamilton, J. K., Rebers, P. A. & Smith, P. - 1955 - Colorimetric method for determination of sugars and related substances. Anal. Chem. 28: 350?356.