Kunio A. Yamaoka, Nobuyuki Miyasaka, Ghen Inuo, Ichiro Saito, Jean-Pierre Kolb, Koichiro Fujita, Sadao Kashiwazaki: 1,1'-Ethylidenebis(tryptophan) (peak E) induces functional activation of human eosinophils and interleukin 5 production from T lymphocytes: Association of eosinophilia-myalgia syndrome with al-tryptophan contaminant. In: Journal of Clinical Immunology. Band14, Nr.1, Januar 1994, S.50–60, doi:10.1007/bf01541175.
