Gorchein, A (1980). "Urine concentration of 3-ethyl-5-hydroxy-4,5-dimethyl-delta 3-pyrrolin-2-one ('mauve factor') is not causally related to schizophrenia or to acute intermittent porphyria". Clinical science (London, England : 1979). 58 (6): 469–76. PMID7428279.
