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2. Bevington, P. R., , Data Reduction and Error Analysis for the Physical Sciences, McGraw-Hill, New York, 1969,
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4. Impact craters from centimeters to megameters;Croft,1979
5. Cratering flow fields: Implications for the excavation and transient expansion stages of crater formation;Croft;Proc. Lunar Planet. Sci. Conf. 11th,1980