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Statistics
Ilersic, Alfred R., (1964)
Statistical methods in management
Cass, Tom, (1973)
Das Reduzieren der Zahlen : statistische Analyse und Interpretation
Ehrenberg, Andrew S. C., (1976)
An introduction to index numbers
Morrell, A. J. H., (1948)
Labour turnover
Morrell, A. J. H., (1955)
Statistics of the chemical industry
Morrell, A. J. H., (1951)