1. Adriaanse, A., Bringezu, S., Hammond, A., Moriguchi, Y., Rodenburg, E., Rogich, D., Schutz, H., 1997. Resource Flows: The Material Basis of Industrial Economies. World Resource Institute, Washington, DC, USA.
2. Agency for Natural Resources and Energy of Japan, 1970–2000. Handbook of Mining. Research Institute of Economy, Trade and Industry, Tokyo, Japan (in Japanese).
3. Accounting for Resources 1: Economy-wide Applications of Mass-balance Principles to Materials and Waste;Ayres,1998
4. Accounting for Resources 2: the Life Cycle of Materials;Ayres,1999
5. Bergstedt, E. and Linder, I. 1999. Material Flow Study of Sand and Gravel in Sweden. Statistics Sweden. (http://www.scb.se/Statistik/MI/MI1202/2000I02/MIFT9903.pdf.).