Geodesic
To be integer or not to be rational: that is the questio$\sqrt{N}$
The Teaching of Mathematics, XVI (2013) no. 2, p. 79 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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Another proof is given of the fact that the square root of a nonnegative integer is either an integer or an irrational. Bibliography on this theme is presented.
Classification : 1MSC97F60 2MathEducF64
Keywords: Rational and irrational numbers. 
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     title = {To be integer or not to be rational: that is the questio$\sqrt{N}$},
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Samuel G. Moreno; Esther M. García-Caballero. To be integer or not to be rational: that is the questio$\sqrt{N}$. The Teaching of Mathematics, XVI (2013) no. 2, p. 79 . http://geodesic.mathdoc.fr/item/TM2_2013_XVI_2_a2/