1. Bennett, A. B. and Della Penna, D. (1987). Polygalacturonase: its importance and regulation in ripening. In:Plant senescence: its biochemistry and physiology.(Thompson, W. W., Nothnagel, E. and Huffaker, R., Eds). American Society of Plant Physiologists, Rockville, MD, USA, 98–107.
2. Pilnik, W. and Voragen, A. G. J. (1970). Pectic substances and other uronides. InThe biochemistry of fruits and their products, Vol. 1.(Hulme, A. C., Ed.). Academic Press, New York, NY. 53–87.