1. Mining Review Africa (2023): Hitachi Construction Machinery's parts remanufacturing initiative, Source, (Refer 2023-11-30).
2. 3R Promotion Council, Reduce, Reuse, Recycle Promotion Council for 3R, Source, (Refer 2022-11-30).
3. Agency for Natural Resources and Energy, Precious Metal Distribution Statistics Survey, Website of METI, Source, (Refer 2022-11-30).
4. The Environmental Profile of Platinum Group Metals
5. Johnson Matthey’s pgm market research;Brown;Homepage of Johnson Matthey, 35-49,2023