1. Borthwick, H. A., Parker, M. W., and Hendricks, S. B. (1948). Wave length dependence and the nature of photoperiodism. In A “Vernalization and Photoperiodism, a Symposium” (A. E. Murneek and R. O. Whyte, eds.), pp. 71–78. Chronica Botanica, Waltham, Massachusetts. Borthwick
2. Action spectrum for inhibition of stem growth in dark-grown seedlings of albino and nonalbino barley (Hordeum vulgare);Hendricks;Bot. Gaz.,1951
3. Dependence of elongation on wavelength of supplementary irradiation;de Lint;Meded. Landbouwhogesch. Wageningen,1961
4. Comparison of incandescent and fluorescent lamps for lengthening photoperiods;Downs;Proc. Am. Soc. Hortic. Sci.,1958
5. An action spectrum for inhibition of the first internode of Avena Aby light;Goodwin;Bull. Torrey Bot. Club,1948