1. Radiometric microbiological assay of B vitamins. part 1: assay procedure
2. The Folacin Contents of Foods as Measured by a Radiometric Microbiologic Method
3. M. Chen, and P.A. McIntyre ,Measurement of the trace amounts of vitamin B12present in various foods by a new radiometric microbiologic technique, in Trace Organic Analysis: A New Frontier in Analytical Chemistry, Hertz, H.S. and Chesler, S.N., Eds .National Bureau of Standards,Washington, DC,1979 , p.257 .
4. Radiometric microbiological assay of B vitamins. part 2: extraction methods