1970s
1974
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Bertrand theorem one hundred years after formulationC. R. Acad. Sci. 278 (11), 455-457 (1974).
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Rev. Mex. Fis. 22 (4), 351 (1974).
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La Magia de las Orbitas ElípticasRev. Mex. Fis. 23, E13 (1974).
‡Undergraduate Student Author
†Graduate Student Author