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David Freedman, Persi Diaconis: N the histogram as a density estimator: theory. 57 1981. 453–476. o. = Zeitschrift für Wahrscheinlichkeitstheorie und verwandte Gebiete, 4. doi:10.1007/BF01025868
„He explained that the histogram could be used for historical purposes to create blocks of time of ‘charts about reigns or sovereigns or periods of different prime ministers’.“. The Rutherford Journal