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4. Gvozdeva, Z. V. (1955). Utilization of unisexual female plants for increasing the productivity of the castor-oil plant. Zemledelie,3: 111–112. (In Russian, Hebrew translation by Atsmon).
5. Hendricks, S. B., andBorthwick, H. A. (1954). Photoresponsive growth. In “Aspects of Synthesis and Order in Growth,” ed. D. Rudnick, Princeton University Press: 149–169.