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Heintz, W.D. Colloque No. 5 de L'Uai La cohésion entre les procédés d'observation des étoiles doubles visuelles (Coordination of Observing Techniques of Visual Double Stars) Nice, France, September 8–10, 1969. Astrophys Space Sci 11, 3 (1971). https://doi.org/10.1007/BF02385012
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DOI: https://doi.org/10.1007/BF02385012