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- [3] Geomagnetic Field Variations as Determined from Bulgarian Archaeomagnetic Data. Part II: The Last 8000 Years Surveys in Geophysics, 1998, 19 : 431 - 460
- [4] Geomagnetic field variations as determined from Bulgarian archaeomagnetic data. Part II: The last 8000 years Surveys in Geophysics, 19 (05): : 431 - 460