Historical Sources: How People Counted. A Method for Estimating the Rounding of Numbers. - Robin Graham Murison Crockett; Alasdair Charles Crockett (Hist. Comput., 1997)

'Base Number Correlation': A New Technique for Investigating Digit Preference and Data Heaping. - Robin Graham Murison Crockett; Alasdair Charles Crockett; Scott J. Turner (Hist. Comput., 2001)