• Gladiali, S. et al., Chem. Ind. (London), 1977, 982, (synth)
• Herzog, H.L. et al., Tetrahedron, 1962, 18, 581, (synth, ir, pmr, uv)
• Smith, L.L. et al., J.O.C., 1958, 23, 960, (spectra)
• McAleer, W.J. et al., J.O.C., 1958, 23, 508, (synth)
• Martindale, The Extra Pharmacopoeia, 28th/29th edn., Pharmaceutical Press, 1982, 12869
• Pechet, M.M. et al., J. Colloid Sci., 1959, 38, 681, (pharmacol)