1. G.C. Hokanson, Pharm. Tech., 18 (1994) 118.
2. G.C. Hokanson, Pharm. Tech., 18 (1994) 92.
3. E. Debesis, J.P. Boehlert, T.E. Givand and J.C. Sheridan, Pharm. Tech., 6 (1982) 120.
4. M. Martin-Smith, Acta. Pharm. Jugosl., 40 (1990) 7.
5. T.D. Wilson, J. Pharm. Biomed. Anal., 8 (1990) 389.