Goldberg; Wragg. 972. Spasmolytics derived from xanthen. Journal of the Chemical Society. 1957: 4823–4829. doi:10.1039/JR9570004823.
Bowden, R. S. T. The Estimation of Blood Urea by the Xanthydrol Reaction. Journal of Small Animal Practice. 1962, 3 (4): 217–218. doi:10.1111/j.1748-5827.1962.tb04191.x.