1. Further observations on the response of various species of plants to the length of day;Allard;Tech. Bull. USDA,1940
2. Confidence regions in non-linear estimation;Beale;J.R. Statis. Soc. (B),1960
3. Photoperiodic perception in Biloxi soybeans;Borthwick;Bot. Gaz.,1939
4. Comparative photoperiodic responses for several soybean varieties of tropical and temperate origin;Byth;Aus. J. Agric. Res.,1968
5. Fitting curves to the relation of age at flowering of plants to photoperiod;Cooke;Biometrics,1971