1. U.S. Pat. 2546174/(4.8.45/27.3.51)
2. U.S. Pat. 3565471/(6.9.47/28.8.51/Am. Pior. 4.8.45) Hercules Powder Co./G.A. Buntin
3. U.S. Pat. 2657164/(8.9.50/27.10.53), Hercules Powder Co./G.A. Buntin
4. Vortrag: Nature, Isolation, Toxity and Metabolism in Rats. Safy Khalifa et al. Division of Entomology and Parasitology, University of California, Berkeley 94720.