1. Harms, C. T., Lörz, H., Potrykus, I., Separation of various protoplast types in step-density gradients (in preparation).
2. Biochemische Cytologie der Pflanzenzelle.,1974
3. Isolation and culture of tobacco mesophyll protoplasts using a saline medium;Meyer;Protoplasma,1974
4. Isolation, fusion and culture of protoplasts from Petunia;Potrykus,1973
5. Uptake of cell organelles into isolated protoplasts;Potrykus,1975