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- nictric acid 1
- Nikel 1
- Niobium 1
- Niobium oxides 1
- Nirlando Antônio Rocha 1
- Niti 3
- nitric acid 1
- Nitro compounds 1
- nitrogen 16 1
- Nílton Carlos Gomes 1
- Nílton Silva Maia 2
- NMR spectra 1
- nmr spectra 1
- nondestructive testing 3
- nonradioactive wastes 1
- Nuclear energy 14
- nuclear energy 6
- nuclear engineering 4
- Nuclear facilites 2
- Nuclear facilities 4