GALBRUN, J., and K. KIJIMA. “Growth Strategy and Hierarchy Theory: Emergence of Super-Players in the Healthcare Computed Tomography Oligopoly”. Proceedings of the 52nd Annual Meeting of the ISSS - 2008, Madison, Wisconsin, vol. 3, no. 1, July 2008, https://journals.isss.org/index.php/proceedings52nd/article/view/966.