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| spectral; spectral density of ...; spectral concentration of ... | |||
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densita spettrale di : 33 phrases in 8 subjects |
| Communications | 3 |
| Earth sciences | 4 |
| Electronics | 17 |
| Life sciences | 2 |
| Lighting other than cinema | 2 |
| Radio | 1 |
| Statistics | 3 |
| Transport | 1 |