1. Bourrelly, P., 1966: Les algues d'eau douce. I. Les algues vertes. ? Paris:N. Boub�e & Cie.
2. Brown, R. M., Bold, H. C., 1964: Phycological studies V. Comparative studies of the algal generaTetracystis andChlorococcum. ? Univ. Texas Publ. no.6417. ? Austin (Texas): University of Texas.
3. Cox, E. R., Deason, T. R., 1968:Axilosphaera andHeterotetracystis, new chlorophycean genera from Tennessee soil. ? J. Phycol.4, 240?249.
4. Deason, D. R., Bold, H. C., 1960: Phycological Studies I. Exploratory Studies of Texas Soil Algae. ? Univ. Texas Publ. no.6022. ? Austin (Texas): University of Texas.
5. Fott, B., 1971: Algenkunde. ? Jena: Fischer-Verlag.