1. 21 USC §331, Federal Food, Drug, and Cosmetic Act (FD&C Act) 2008
2. 21 USC §342, Federal Food, Drug, and Cosmetic Act (FD&C Act), Chapter VI. Food, Section 402, Adulterated Food 2007
3. Competing with gray markets;Antia;MIT Sloan Manage Rev,2004
4. Use of the internet and e-mail for health care information;Baker;JAMA: J Am Med Assoc,2003
5. Strategies to combat the sale of gray market goods;Berman;Bus Horiz,2004