Open Mathematics > 2006 > 4 > 2 > 319-322
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journal ISSN : | 2391-5455 |
DOI | 10.2478/s11533-006-0011-z |
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Bibliography
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[1] M. Aigner and G.M. Ziegler: Proofs from THE BOOK, 3rd ed., Springer, 2004.
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[2] D.H. Lehmer: “A note on trigonometric algebraic numbers”, Amer. Math. Monthly, Vol. 40, (1933), pp. 165–166.
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[3] I. Niven: Irrational numbers, Carus Monographs, Vol. 11, The Mathematical Association of America (distributed by John Wiley and Sons), 1956.