1. The National Immunization Survey;McCauley;Am J Prev Med,2001
2. Forty years and four surveys;Simpson;Am J Prev Med,2001
3. National, state, and urban-area vaccination-coverage levels among children aged 19–35 months, United States, 1999;Luman;Am J Prev Med,2001
4. Immunization pockets of need;Santoli;Am J Prev Med,2000
5. The measles epidemic;JAMA,1990