1. Unintentional opiate overdose deaths—King County, Washington, 1990–1999;Centers for Disease Control and Prevention;Morbidity and Mortality Weekly Report,2000
2. Unintentional and undetermined poisoning deaths—11 states, 1990–2001;Centers for Disease Control and Prevention;Morbidity and Mortality Weekly Report,2004
3. Deaths: Injuries, 2002;Centers for Disease Control and Prevention;National Vital Statistics Report,2006
4. Opiates, cocaine and alcohol combinations in drug overdose deaths in New York City, 1990–1998;Coffin;Addiction,2003