1. The Complete Drug Reference;Martindale,1999
2. Clarke's Isolation and Identification of Drugs in Pharmaceuticals, Body Fluids and Post-mortem Materials;Clarke,1986
3. J. Vachek. Czech. CS; 236, 599, (1986). Through Chem. Abst. (106), 182777w.
4. B. Trtik. Czech. CS; 239, 22, (1987). Through Chem. Abst. (110), 13664j.