1. Aomori Prefecture 2007 Specified Obstacle Removal Implementation Plan Proposal Relating to Illegal Dumping Cases in Aomori and Iwate Prefectures
2. Chiba Prefecture 1998 Ordinance on Prevention of Pollution and Disasters from Soil/Sand Landfills in Chiba Prefecture
3. Environmental Dispute Coordination Commission 2007 Fiscal Year 2007 Annual Report of the Environmental Dispute Coordination Commission
4. Ministry of Economy, Trade and Industry 2004 Waste and Recycling Governance Guidelines for Emitting Corporations