1. Feldmann, A.: Beiträge zur Strahlenstimulation III. Einfluß der Temperatur auf die strah-leninduzierte Wachstumsförderung beiLemna minor L. Radiation Bot.11, 59?65 (1971).
2. Hatchard, C. G., Parker, C. A.: A new sensitive chemical actinometer II potassium ferrioxalat as a standard chemical actinometer. Proc. Roy. Soc. London Å235, 518 (1956).
3. Hermann, S.: A practical method to conserve pollen of forest trees under vacuum. Paper given on the 2nd World Consultation on Forest Tree Breeding, Washington D. C. 1969.
4. Mascarenhas, J. P.: Pollen tube growth and RNA synthesis by vegetative and generative nuclei of tradescantia. Am. J. Botany53 (6), 563?569 (1966).
5. Sparrow, A. H.: Plant growth stimulation by ionizing radiation. In: Effect of low doses of radiation on crop plants, p. 12?15. Vienna: IAEA 1966.