Geodesic
On Whitney's theorem and constants
Sbornik. Mathematics, Tome 81 (1995) no. 2, pp. 281-295 
Yu. V. Kryakin. On Whitney's theorem and constants. Sbornik. Mathematics, Tome 81 (1995) no. 2, pp. 281-295. http://geodesic.mathdoc.fr/item/SM_1995_81_2_a1/
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Voir la notice de l'article provenant de la source Math-Net.Ru

It is proved that the Whitney constants are bounded by 2.

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