Numismatic Die Count and Axes Statistical Tools
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Carter, G. F., A Simplified Method for calculating the original number of dies from die link statistics. ANSMN 28 (1983), p. 195-206
W. Esty, How to estimate the original number of dies and the coverage of a sample. NC 166 (2006), pp. 359-364
W. Esty, The Geometric Model for Estimating the Number of Dies. in QUANTIFYING MONETARY SUPPLIES IN GRECO-ROMAN TIMES (2011), Edipuglia s.r.l., pp. 43-58

Forest, T. G., Circular Statistics