Nebulosa do Ovo (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Nebulosa do Ovo" in Portuguese language version.

refsWebsite

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aanda.org

S. De Ruyter, H. Van Winckel, T. Maas, T. Lloyd Evans, L. B. F. M Waters, & H. Dejonghe (2006). «Keplerian discs around post-AGB stars : a common phenomenon?». Astronomy & Astrophysics. 448. pp. 641-653