1. Beatty, A. V. and Beatty, W., Physiological effects of X-radiation in various percentages of oxygen onTradescantia microspores. Am. J. Botany42, 288?292 (1955).
2. Ehrenberg, L., The radiation induced growth inhibition in seedlings. Botan. Notiser108, 184?215 (1955).
3. Kuzin, A. M., The utilization of ionizing radiation in agriculture. Proced. Intern. Conf. Peaceful Uses Atomic Energy (Geneva)12, 149?156 (1956).
4. Sax, K., The effect of ionizing radiation on plant growth. Amer. J. Botany42, 360?364 (1955).
5. Wort, D. J., X-ray effects on the growth and reproduction of wheat. Plant Physiol.8, 287?296 (1941).