33 citations · 278 across the 30 of their papers we have counts for
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astro-ph2004★ 8 cited
Spectral Types of Field and Cluster O-Stars
Sidney van den Bergh
The recent catalog of spectral types of Galactic O-type stars by Mai'z-Apella'niz et al. has been used to study the differences between the frequencies of various subtypes of O-typ…
astro-ph2004★ 2 cited
Shapley-Ames Galaxies in the Blue and Infrared
Sidney van den Bergh
The Shapley-Ames Catalog of 1276 galaxies with B < 12.5 is compared with the Sanders et al. all sky sample of the 629 galaxies with 60 m flux density > 5.24 Jy. The fraction of Sha…