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- Optical properties 1
- optical properties 2
- optimization 5
- orçamento 1
- ore composition 1
- ore enrichment 1
- ore processing 2
- Ores 1
- ores 2
- Organic fluorine compounds 1
- Organic mercury compounds 1
- Organometallic compounds 4
- Organotin carboxylates 1
- ORNL 1
- Oromar Moreira 1
- Oscillators 1
- Osmar Lourenço Ribeiro 1
- Ouro Preto 1
- Oxidation 1
- oxidation 3