| English version George Allen and Unwin, 1964 | A proof for the cosine case appears as Lemma 12 in Bennett, Curtis D |
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| Fourier Analysis and its Applications | Louck, and , A Generalization of a Curiosity that Feynman Remembered All His Life, Math |
Everyone has the right to the protection of the moral and material interests resulting from any scientific, literary or artistic production of which he is the author".
| Protter, Murray H; Morrey, Charles B | Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables |
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| , International Symposium on History of Machines and Mechanisms, Springer, 2004 See Maor 1998 , chapter 3, for an earlier etymology crediting Gerard | Institute for the History of Arabic Science, University of Aleppo |