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Photoheliograph (PhoKa)
more details about the instrument can be found in:
Pettauer, T.: The Kanzelhöhe Photoheliograph,
in The Dynamic Sun, Proceedings of the 6th European Meeting on Solar Physics
held in Debrecen, 21-24 May, 1990. Edited by L. Dezso. Publ. of Debrecen
Heliophysical Observatory of the Hungarian Academy of Sciences, 7, 62-63,
1990
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