^Nakamura, A; Kikuchi, K; Ohishi, T; Masuike, T. [Assay method for uracil, dihydrouracil, 5-fluorouracil and 5-fluoro-5, 6-dihydrouracil by high-performance liquid chromatography].. Gan to kagaku ryoho. Cancer & chemotherapy. March 2004, 31 (3): 381–6. PMID 15045945.