1. Altmann, R., 1890, Die Elementarorganismen und ihre Beziehungen zu den Zellen, Veit, Leipzig.
2. Awramik, S. M., Golubic, S., and Barghoorn, E. S., 1972, Blue-green algal cell degradation and its implication for the fossil record, Geol. Soc. Am. Abstr. Progr. 4 (7): 438.
3. Barghoorn, E. S., and Schopf, J. W., 1965, Microorganisms from the Late Precambrian of central Australia, Science
150: 337–339.
4. Bhârâdwâjâ, Y., 1933, False branching and sheath-structure in the Myxophyceae, with special reference to the Scytonemataceae, Arch. Protistenkd. 81: 243–383.
5. Bird, C. W., Lynch, J. M., Pirt, F. J., Reid, W. W., Brooks, C. J. W., and Middleditch, B. S., 1971, Steroids and squalene in Methylococcus capsulatus grown on methane, Nature (London)
230: 473–474.