1. Carstairs, G. M., Kapur, R. L.: The Great Universe of Kota. Berkeley: University of California Press 1976
2. Cooper, J. E., Kendall, R. E., Gurland, B. J., Sharpe, L., Copeland, J. R. M., Simon, R.: Psychiatric diagnosis in New York and London. London: Oxford University Press 1972
3. Cooper, J. E., Copeland, J. R. M., Brown, G. W., Harris, T., Gourlay, A. J.: Further studies on interviewer training and interrater reliability of the Present State Examination. Psychol. Med. 7, 517?523 (1977)
4. Deming, W. E.: An essay on screening, or on two-phase sampling, applied to surveys of a community. International Statistical Review 45, 29?37 (1977)
5. Duncan-Jones, P.: Planning and piloting a two-phase psychiatric community survey. Bulletin of the International Statistical Institute, 47, Book 4 (Proceedings of the 41st Session, New Delhi), 160?163 (1977)