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- [9] PHOTO-ELECTRIC OBSERVATIONS OF ECLIPSING BINARY V 1073 CYGNI BULLETIN OF THE ASTRONOMICAL INSTITUTES OF THE NETHERLANDS, 1968, 2 (07): : 377 - &
- [10] The use of photo-electric selenium cells for precise photometry COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES, 1939, 209 : 300 - 301