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Sampling techniques
Cochran, William G., (1953)
Stochastic compactness of sample extremes
Haan, L. de, (1977)
Sample extremes : an elementary introduction
Haan, Laurens de, (1976)
Stichprobenverfahren
Cochran, William G., (1972)
Statistical methods
Snedecor, George W., (1967)