1. Drugs may outlast label date;Woods,2005
2. Many medicines prove potent for years past their expiration dates;Cohen;The Wall Street Journal,2000
3. Program extends drug shelf-life;Garamone,2000
4. Pharmaceutical Expiration Dates;American Medical Association,2001
5. A study of the stability of some commercial drug dosage forms beyond their expiration dates;Stark;Pharm J,1997