1. The evolution of pigmented and unpigmented unicells—A reconsideration of the protista
2. N. Melkonian (1990) in `Handbook of Protoctista' (Margulis, L., Corliss, J.O., Melkonian, M. and Chapman, D.J., eds) pp 608–616, Johns and Bartlett, Boston.
3. K.R. Mattox and K.D. Stewart (1984) in `Systematics of the Green Algae' (Irvine, D.E.G. and John, D.M., eds.) pp 29–72 Academic Press, London.
4. Structure of the three β-tubulin-encoding genes of the unicellular alga, Polytomella agilis