1. J.J. Skvarla and J. W. Nowicke, Pollen fine structure and relationships of Achatocarpus Triana and Paulothamnus A. Gray, Taxon 31, 244–249 (1982).
2. T. J. Mabry and H.-D. Behnke (editors), Evolution of centrospermous families (a symposium held on July 1975 during the Xiith Botanical Congress, Leningrad), Plant Syst. Evol. 126, 1–106 (1977): T. Eckhardt, Morphological features, 5–25; E Ehrendoreer, Chromosome numbers, 27–30; H.-D. Behnke, Sieve-element plastids, 31–54; J.J. Skvarla and J. W. Nowicke, Ultrastructure of pollen exine, 55–78; T. J. Mabry, Pigment dichotomy and DNA-RNA hybridisation data from centrospermous families, 79–94; Tabellarische Darstellung der Merkmale und Schlußbetrachtungen ( Behnke; Ehrendorfer ), 95–106.
3. H.-D. Behnke, Sieve-tube plastids in relation to Angiosperm systematics — An attempt towards a classification by ultrastructural analysis, Bot. Review 38, 155–197 (1972).
4. G. T. Cole and H.-D. Behnke, Electron microscopy and plant systematics, Taxon 24, 3–15 (1975).
5. H.-D. Behnke, Transmission electron microscopy and systematics of flowering plants, Plant Syst. Evol., Suppl. 1, 155–178 (1977).