Toru Hasunuma Yosuke Kikuchi Takeshi Mori Yukio Shibata On the number of cycles in generalized Kautz digraphs. 127-140 2004 285 Discrete Mathematics 1-3 http://dx.doi.org/10.1016/j.disc.2004.01.014 db/journals/dm/dm285.html#HasunumaKMS04