1. Brim C A and Burton J W 1979 Recurrent selection in soybeans. II. Selection for increased percent protein in seeds. Crop Sci. 19, 494?498.
2. Brun W A 1976 The relation of N2 fixation and photosynthesis. In World Soybean Research. Ed. L DHill. pp 135?143. The Interstate Printers and Publishers, Inc., Danville, IL.
3. Burkey K O and Wells R 1991 Response of soybean photosynthesis and chloroplast membrane function to canopy development and mutual shading. Plant Physiol. 97, 242?252.
4. Burton J W 1987 Quantitative genetics: results relevant to soybean breeding. In Soybeans: Improvement, Production, and Use. Agronomy 16, 2nd. ed. Ed. J RWilcox. pp 211?247. American Society of Agronomy, Madison, WI, USA.
5. Burton J W 1989 Breeding soybeans for increased seed protein percentage. In World Soybean Research Conference IV: Proceedings. Vol II. Ed. A JPascal. pp 1079?1085. Orientación Grafica Editora S R L, Buenos Aires, Argentina.