1. I. C. M. Code , use in mining, https://www.cyanidecode.org/cyanide-facts/use-mining
2. Methionine production—a critical review
3. J. R. Hart , in Ullmann's Encyclopedia of Industrial Chemistry , 2000
4. C. Gousetis and H.-J.Opgenorth , in Ullmann's Encyclopedia of Industrial Chemistry , 2011
5. L. D. Pesce , Kirk-Othmer Encycl. Chem. Technol. , 2000 , 8 , 171–199