1. Ericson, W.A.: Optimum stratified sampling using prior information. J.A.S.A.60, 1965, 750–771.
2. Kokan, A.R., andS.U. Khan: Optimum Allocation in Multivariate Surveys. An Analytical solution. Jour. Roy. Stat. Soc. Ser. B.2, 1967, 115–125.
3. Kuhn, H.W., andA.W. Tucker: Non-linear Programming. Proceedings of the second Berkeley Symposium on Mathematicel Statistics and probability, 1952.
4. Raifa, H., andR. Schlaifer: Applied Statistical decision theory. Boston 1961.