1. Arnold, R. L., O. E. Olson and C. W. Carlson, 1971. Unpublished data, South Dakota Agricultural Experiment Station
2. Arnold, R. L., 1971. Effects of various levels of dietary selenium and arsenic on chickens. Ph.D. Thesis, South Dakota State University
3. Fluorometric analysis of selenium in plants;Olson;J. Assoc. Offic. Anal. Chem.,1969