Yang, S., Logan, J., & Coffey, D. L. (1995). Mathematical formulae for calculating the base temperature for growing degree days. In Agricultural and Forest Meteorology (Vol. 74, Issues 1-2, pp. 61-74). Elsevier BV
Magoon, C. A., & Culpepper, C. W. (1932). Response of sweet corn to varying temperatures from time of planting to canning maturity (No. 1488-2016-124513).
Stier, H. S. (1939). A physiological study of growth and fruiting in the tomato (Lycopersicon esculentum L.) with reference to the effect of climatic and edaphic conditions (Doctoral dissertation, Ph. D. Dissertation, University of Maryland, College Park, MD, USA).
Arnold, C. Y. (1959, January). The determination and significance of the base temperature in a linear heat unit system. In Proceedings of the american Society for horticultural Science (Vol. 74, No. 1, pp. 430-445).
Nuttonson, M. Y. (1955). Wheat-climate relationships and the use of phenology in ascertaining the thermal and photo-thermal requirements of wheat. Amer. Inst. of Crop Ecology, Washington, D.
Hoover, M. W. (1955). Some effects of temperature on the growth of southern peas. In Proc. Am. Soc. Hortic. Sci (Vol. 66, pp. 308-312).