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| Artificial periodic irregularities and investigations of sporadic e-layers | 253 |
| January 2025 | February 2025 | March 2025 | April 2025 | May 2025 | June 2025 | July 2025 | |
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| Artificial periodic irregularities and investigations of sporadic e-layers | 7 | 14 | 5 | 8 | 5 | 8 | 2 |
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| PID5654761.pdf | 33 |
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| Russia | 140 |
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