1.

雑誌
雑誌
1. Aerospace research in Bulgaria
Bulgarian Academy of Sciences, Space Research Institute
出版情報: Sofia : Bulgarian Academy of Sciences, Space Research Institute, 2003-
巻次（年次）: Vol. 17 (2003)-
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2.

雑誌
雑誌
2. Bulgarian astronomical journal
Bulgarian Academy of Sciences, Institute of Astronomy and Rozhen NAO, Bulgarian Astronomical Society
出版情報: Sofia : Institute of Astronomy, Bulgarian Academy of Sciences
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