Geodesic
Vahlen theorem for two-dimensional convergents
Matematičeskie zametki, Tome 66 (1999) no. 1, pp. 30-37 
V. A. Bykovskii. Vahlen theorem for two-dimensional convergents. Matematičeskie zametki, Tome 66 (1999) no. 1, pp. 30-37. http://geodesic.mathdoc.fr/item/MZM_1999_66_1_a3/
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     title = {Vahlen theorem for two-dimensional convergents},
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] Voronoi G. F., “Ob odnom obobschenii algorifma nepreryvnykh drobei”, Sobranie sochinenii, T. 1, Kiev, 1952, 197–391

[2] Venkov B. A., Elementarnaya teoriya chisel, ONTI, M., 1937

[3] Kassels Dzh., Vvedenie v teoriyu diofantovykh priblizhenii, IL, M., 1961