1. Howard, J.W., E.W. Turicchi, R.H. White and T. Fazio,J. Assoc. Off. Anal. Chem. 49:1236 (1966).
2. Grimmer, G., and A. Hildebrand,Chem. and Ind. 1967:2000 (1967).
3. Biernoth, G., and H.E. Rost, Ibid.:2002 (1967).
4. Biernoth, G., and H.E. Rost,Arch. Hyg. 152:238 (1968).
5. Grimmer, G., and A. Hildebrandt, Ibid.:255 (1968).