Kosuge, T., Heskett, M.G. and Wilson, E.E. (1966). „Microbial synthesis and degradation of indole-3-acetic acid. I. The conversion of L-tryptophan to indole-3-acetamide by an enzyme system from Pseudomonas savastanoi”. J. Biol. Chem.241: 3738-3744. PMID5916389.