Ξανθάκης, Ι. Ν. (1965). The different indices of solar activity and the time of rise. Athens: Research and Computing Center, Academy of Athens.
Παραπομπή Chicago StyleΞανθάκης, Ιωάννης Ν. The Different Indices of Solar Activity and the Time of Rise. Athens: Research and Computing Center, Academy of Athens, 1965.
Παραπομπή MLAΞανθάκης, Ιωάννης Ν. The Different Indices of Solar Activity and the Time of Rise. Athens: Research and Computing Center, Academy of Athens, 1965.
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