1. 1. K. Hermansen, “The Pharmacology of Some Beta-adrenergic Blocking Agents”, 1971, Chaps. 3 and 9, Munlesgaard, Copenhagen.
2. 2. K. Florey, “Analytical Profile of Drug Substances,” 1986, Vol. 15, The Squibb Institute for Medical Research, New Brunswick, 511.
3. 3. British Pharmacopeia, HMSO, London, 1988, 996.
4. 4. United States Pharmacopoeia, XXII, NF XVII, USP Convention Inc., Rockville, 1990, 1091.