Geodesic
A formula for the number of Euler cycles of a complete graph $U_n$
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 24 (1969) no. 6 
V. A. Sorokin. A formula for the number of Euler cycles of a complete graph $U_n$. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 24 (1969) no. 6. http://geodesic.mathdoc.fr/item/RM_1969_24_6_a4/
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     title = {A~formula for the number of {Euler} cycles of a~complete graph~$U_n$},
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] O. Ore, Teoriya grafov, «Nauka», M., 1968 | MR

[2] Van Aardenne, Ehrenfest, N. G. de Brÿn, “Circuits and trees in oriented graphs”, Simon Stevin, 28 (1951), 203–217 | MR | Zbl