• Gonzlez, A.G. et al., An. Quim., 1973, 69, 1013, (pmr)
• Head, F.G.H. et al., J.C.S., 1931, 1241, (synth)
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• Herath, W.H.M. et al., Phytochemistry, 1978, 17, 1007, (isol)
• Aldrich Library of FT-IR Spectra, 1st edn., 1985, 2, 324B, (ir)
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• Karrer, W. et al., Konstitution und Vorkommen der Organischen Pflanzenstoffe, 2nd edn., Birkhuser Verlag, Basel, 1972, nos. 1328; 1329, (occur)
• Hauer, H. et al., Arch. Pharm. (Weinheim, Ger.), 1995, 328, 737, (synth)
• Ishibura, N. et al., Z. Naturforsch., C, 1979, 34, 628
• Murray, R.D.H. et al., The Natural Coumarins, J. Wiley, 1982, (occur, rev)
• Koul, S.K. et al., Indian J. Chem., Sect. B, 1987, 26, 574, (synth)
• Mizuno, M. et al., Phytochemistry, 1992, 31, 717, (deriv)