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Sojka, R.E. and Arnold, F.B. and Morrison III, W.H. and Busscher, W.J. (1988) Effect of early and late planting on sunflower performance in the southeastern United States. Applied Agricultural Research. 4(1):37-46.
Sojka, R.E. and Sadler, E.J. and Camp, C.R. and Arnold, F.B. (1990) A comparison of pressure chamber, leaf-press, and canopy temperature for four species under humid conditions. Environmental and Experimental Botony. 30(1):75-83.
Sojka, R.E. and Sadler, E.J. and Camp, C.R. and Arnold, F.B. (1987) Comparison of Campbell-leaf press with standard plant water stress measurements for four species. pp. 39-45. In: Proc. of Int. Conf. on Meas. of Soil & Plant Water Status, Vol. 2. 1987.