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- International Astronomical Union (6)
- International Astronomical Union. Symposium (3)
- International Scientific Radio Union (2)
- Astronomisches Rechen-Institut, Heidelberg (1)
- Burkhardt, G. (1)
- Böhme, Siegfried (1)
- COSPAR (1)
- Esser, U. (1)
- Fachinformationszentrum Energie, Physik, Mathematik (1)
- Heinrich, Inge (1)
- Jager, C. de (Cornelis de), 1921- (1)
- Kerr, F. J. (1)
- Kiepenheuer, K. O. (Karl Otto) (1)
- O'Dell, Charles Robert (1)
- Osterbrock, Donald E. (1)
- Rodgers, A. W. (1)
- Schmadel, Lutz D. (1)
- Symposium on Solar Flares and Space Research (1968 : Tokyo, Japan) (1)
- Woerden, Hugo van (1)
- Švestka, Zdeněk (1)