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1. Proper motions of 41 variable stars in the photographic zone of Helsinki Observatory, by Örlander, Lehti, Pipping et Savalius (Commentationes Physico-Mathematicae, Societas Scientiarum Fennica, 22, 2).Google Scholar
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2. Proper motions, mean parallaxes and space velocities of RR Lyrae variables, by Van Herk, G. (1965, Bull. astr. Inst. Netherlands, 18, 71–105).Google Scholar
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3. Catalogue des nébuleuses extragalactiques de la zone —5° à —25° de déclinaison choisies pour la détermination des mouvements propres absolus stellaires (Pourtau, Milet, Observatoire de Bordeaux).Google Scholar
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4. A search for faint blue stars, no. XVII, XXI, XXIX, XXXVII (Luyten, W. J., The Observatory, University of Minnesota, Minneapolis).Google Scholar
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5. Améliorations des constantes de clichés en utilisant leurs recouvrements (Lacroute, P., 1964, Ann. Obs. Strasbourg, 6, 97–111).Google Scholar
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6. Etude sur l'établissement d'un catalogue photographique (Lacroute, P., 1964, Ann. Obs. Strasbourg, 6, 113–127).Google Scholar