NGC 1931 (Arabic Wikipedia)

Analysis of information sources in references of the Wikipedia article "NGC 1931" in Arabic language version.

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A.K. Pandey؛ H.S. Mahra (1986). "Photometry of Open Cluster NGC 1931". Astrophysics and Space Science. ج. 120 ع. 1: 107–113. Bibcode:1986Ap&SS.120..107P. DOI:10.1007/BF00653902.

Per Collinder (1931), On Structural Properties of Open Galactic Clusters and their Spatial Distribution. Catalog of Open Galactic Clusters (PDF) (بالإنجليزية), vol. 2, p. 1, Bibcode:1931AnLun...2....1C, QID:Q28806527
A.K. Pandey؛ H.S. Mahra (1986). "Photometry of Open Cluster NGC 1931". Astrophysics and Space Science. ج. 120 ع. 1: 107–113. Bibcode:1986Ap&SS.120..107P. DOI:10.1007/BF00653902.