Reference
- Birnbaum , Z. W. and Sirken , Monroe G. October 1965 . “Design of Sample Surveys to Estimate the Prevalence of Rare Diseases: Three Unbiased Estimates,” , October , Washington , D. C. : U. S. Government Printing Office . Vital and Health Statistics, PHS Publication No. 1000–Series 2, No. 11, National Center for Health Statistics