Each regular 3-partite tournament has a 9-cycle
An. Univ. Bucurecsti Mat. 56 (2007), no. 1, 91--120.
BibTex references
@Article\{SV07,
author = "Stella, Irene and Volkmann, Lutz",
title = "Each regular 3-partite tournament has a 9-cycle",
journal = "An. Univ. Bucurecsti Mat.",
number = "1",
volume = "56",
pages = "91--120",
year = "2007",
}