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Article / Letter to editor
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Oort, J.H.
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Pels, G.
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Schmidt, M.
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Westerhout, G.; Oort, J.H.
1951
A comparison of the intensity distribution of radio-frequency radiation with a model of the galactic system
Article / Letter to editor
open access
Oort, J.H.; Schmidt, M.
1951
Differences between new and old comets
Article / Letter to editor
open access
Oosterhoff, P.T.
1951
Photo-electric colours of southern early-type stars
Article / Letter to editor
open access
Pels, G.; Perek, L.
1951
Proper motions of faint early type stars near the north galactic pole
Article / Letter to editor
open access
Pels, G.
1951
Photographic positions of minor planets (51), (135) and (1036) and of comet Minkowski, observed in 1947, 1949 and 1950
Article / Letter to editor
open access
Morgan, H.R.; Oort, J.H.
1951
A new determination of the precession and the constants of galactic rotation
Article / Letter to editor
open access
Fokker, A.D.
1951
Measures of double stars
Article / Letter to editor
open access
Schmidt, M.
1951
The variation of the total brightness of comets with heliocentric distance
Article / Letter to editor
open access