1. Bal, A., 1974: Cellulase. In: Electron microscopy of enzymes (Hyat, M., ed.), Vol. 3, pp. 68?79. New York: Van Nostrand Co.
2. Hartig, T., 1862: über die Bewegung des Saftes in den HolzPflanzen. 12. In den MilchsaftgefÄ\en. Bot. Zeit. (Berlin)20, 97?100.
3. Jensen, W. A., Fisher, D. B., 1969: Cotton embryogenesis the tissues of the stigma and style and their relation to the pollen tube. Planta84, 97?121.
4. Karnovsky, M. J., 1965: A formaldehyde-glutaraldehyde fixative of high osmolality for use in electron microscopy. J. Cell Biol.27, 137 A.
5. Konar, R. N., Stanley, R. G., 1969: Polygalacturonase in normal and abnormal tomato fruit. Biochem. J.92, 324?332.