1. Furlong, J. R., Chem. Trade J., 1943, 165; Bull. Insp. Inst., Oct.–Dec. 1943.
2. British Pharmacopoeia 1968, p. 936.
3. Sair, L., Ind. Eng. Chem. Anal., 1942, 14, 843.
4. Sprockhoff, M., Zeit. Spiritusind., 1929, 52, 27.
5. British Standard Specification, BS 4317: Part 2, 1968.