Generalizations of the Brachistochrone problem. (English)
Pi Mu Epsilon J. 13, No. 4, 207-218 (2011).
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History of science and conceptual change: The formation of shadows by extended light sources. (English)
Sci. Educ. (Dordr.) 18, No. 9, Spec. Iss., 1135-1151 (2009).
2
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