Bohlke, R. A., H. H. Stein, A. R. Wirt, and R. C. Thaler. 2003. Differences in total tract and ileal digestibility coefficients of calcium and phosphorus in growing pigs fed low phytate corn, normal corn, soybean meal, and corn soybean meal based diets. J. Anim. Sci. 81(Suppl. 1):100 (Abstr.) Link to abstract (.pdf)