1. Flocker, W.J. and H. Timm. 1966. Effect of soil moisture tension and physical condition of soil on utilization of water and nutrients by potatoes. Agron J 58:290–293.
2. Hammond, M.W. and D.J. Mulla. 1989. Field variability in soil fertility: Its assessment and management for potato production. Proc 28th Ann Wash State Potato Conf and Trade Fair, pp. 13–22.
3. Howard, F.D., J.R Laborde, M. Yamaguchi and K.E. Knott. 1961. Studies of internal blackspot of California-grown White Rose potato tubers. Proc Amer Soc Hort Sci 78:406–412.
4. Ilker, R.A., A.R. Spurr and H. Timm. 1977. Ethylene pretreatment and blackspot of potato tubers,Solarium tuberosum: Histochemistry and histology of wound healing. Z Pflanzenphysiol 83:55–68.
5. Iritani, W.M. and L. Weiler. 1972. Influence of growing conditions on storage and process ability of Russet Burbank potatoes. Proc 11th Ann Wash State Potato Conf and Trade Fair, pp. 15–19.