1978 Effect of Light on Vegetative Growth, Nut Development and Return Bloom Ryugo, K., D.E. Ramos, B. Marangoni, R. Snyder. 1978.
1977 Behavior of Walnut Spurs Under Sun and Shade Ramos, D., B. Marangoni, R. Snyder, D. Holmberg, K. Ryugo. 1977.
