Takao Ito, Kazuhito Fukuda, Passerini Katia, and Sakamoto Makoto, “Centrality Analysis in the Keiretsu of MAZDA,” Proceedings of the 9th International Business Information Management Association (IBIMA), ISBN: 978-0-9753393-8-1, 4- 6 January 2008, Marrakech, Morocco, p.504-510.
Takao Ito, Masanori Tsujino, and Sakamoto Makoto, “Limit Cycles in the Keiretsu of MAZDA,” Proceedings of the 9th International Business Information Management Association (IBIMA), ISBN: 978-0-9753393-8-1, 4- 6 January 2008, Marrakech, Morocco, p.1141-1147.
Suguru Fukuoka, Takao Ito, Katia Passerini, and Makoto Sakamoto, “An Analysis between Transaction and Cross Shareholdings in the Keiretsu of Nissan,” Proceedings of the 6th International Business Information Management Association (IBIMA), ISBN: 978-0-9753393-5-0, 19- 21 June 2006, Bonn, Germany, p.163-169.