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References
Shelley, D., Nature, 220, 1020 (1968).
Hills, E. S., Nature, 226, 345 (1970).
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SHELLEY, D. Fitting Boulders. Nature 227, 1377 (1970). https://doi.org/10.1038/2271377c0
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DOI: https://doi.org/10.1038/2271377c0