2Barnes. Paul and Oloruntoba. Richard, Assurance of Security in Maritime Supply Chains. Conceptual Issues of Vulnera bility and Crisis Management [J]. Global Security Risks and International Competitiveness, 2005 (12) . 519-540.
3Jensen. M. and Meckling. W. Theory of Firm Managerial Behavior, Agency Costs and Ownership Structure [J]. Journal of Finance Economics, 1976 (3). 305-360.
