1. Baker, H.G., Baker, I. (1983) Floral nectar sugar constituents in relation to pollinator type. In: Handbook of experimental pollination Biology, pp. 117?141, Jones, C.E., Little, R.J., eds. Scientific & Academic Editions, London, UK
2. Berry, A.M., Torrey, J.G. (1983) Root hair deformation in the infection process of Alnus rubra. Can. J. Bot. 61, 2863?2876
3. Carlson, J.B. (1973) Morphology. In: Soybeans: Improvement, production and uses, pp. 17?95, Caldwell, B.E., ed. American Society of Agronomists, Madison, Wis., USA
4. Carlquist, S. (1956) On the occurrence of intercellular pectic warts in Compositae. Am. J. Bot. 43, 425?429
5. Darvill, A.G., McNiel, M., Albersheim, P. (1980) The primary cell wall of flowering plants. In: The plant cell, pp. 91?162, Tolbert, N.E., ed., Academic Press, New York