 |
| perturbation: 134 phrases in 23 subjects |
| Agriculture | 1 |
| Astronautics | 1 |
| Communications | 17 |
| Earth sciences | 12 |
| Economy | 8 |
| Electronics | 23 |
| Energy industry | 2 |
| Environment | 14 |
| Finances | 11 |
| General | 2 |
| Health care | 4 |
| Information technology | 2 |
| Labor law | 1 |
| Law | 4 |
| Life sciences | 11 |
| Materials science | 1 |
| Mechanic engineering | 1 |
| Medical | 6 |
| Metallurgy | 1 |
| Natural sciences | 4 |
| Physical sciences | 1 |
| Statistics | 4 |
| Transport | 3 |