Physics
Scientist
Sterrewacht Leiden, P.O. Box 9513, 2300 RA Leiden, the Netherlands
A new photo-electric method of classification of luminosity and spectral type for O-and B-type stars
Auxiliary equipment of an astronomical photometer
Description of the line-profile contracting apparatus of the Astronomical Institute
Discovery of additional pulsation modes in AI Velorum
Five channel photometric observations of stars in the Magellanic Clouds and in the Milky Way
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