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- Photographic observations of RS Bootis, an RR Lyrae-type variable with long secondary period (Errata: 10 310)
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- Differences in photovisual magnitude between the components of double stars, mainly measured by J. G. Ferwerda and -
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- The observations of brightness, colour and radial velocity of δ Cephei and the pulsation hypothesis (Errata: 10 258, 310)
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- On an asymptotic relation between the variations of luminosity and radius in the theory of Cepheid variables