1. M. Holden, in “Chemistry and Biochemistry of Plant Pigments,” Vol. 2, 2nd Ed., ed. by T. W. Goodwin, Academic Press, London, New York, 1976, pp. 2–37.
2. J. Komarek and B. Fott, in “Das Phytoplankton des Süsswassers: Chlorophyceae,” ed. by Huber-Pestalozzi, E. Schweizerbartsche Verlangsbuchhandlung, Stuttgart, 1983, pp. 1044.