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Colour equivalents of 191 stars near the North Pole
Doorn, N.W. 1927
Colour equivalents of 191 stars near the North Pole
Article / Letter to editor
open access
The solar motion from radial velocities of the absolutely brightest stars of spectra F, G, K and M
Oort, J.H.; Doorn, N.W. 1925
The solar motion from radial velocities of the absolutely brightest stars of spectra F, G, K and M
Article / Letter to editor
open access