參考文獻
- ^ Piskunov, A. E.; et al, Tidal radii and masses of open clusters, Astronomy and Astrophysics, January 2008, 477 (1): 165–172, Bibcode:2008A&A...477..165P, doi:10.1051/0004-6361:20078525
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- ^ Koç, Seliz; Yontan, Talar; Bilir, Selçuk; Canbay, Remziye; Ak, Tansel; Banks, Timothy; Ak, Serap; Paunzen, Ernst. A Photometric and Astrometric Study of the Open Clusters NGC 1664 and NGC 6939. The Astronomical Journal. 2022, 163 (4): 191. Bibcode:2022AJ....163..191K. S2CID 247058424. arXiv:2202.11126 . doi:10.3847/1538-3881/ac58a0.
- ^ Michael Fritz: „NGC 1664: ein tintenfischförmiger offener Sternhaufen「, in Sterne und Weltraum Januar 2013 S. 66
- ^ Seligman. [2023-01-30]. （原始內容存檔於2016-11-25）.
維基共享資源上的相關多媒體資源：NGC 1664
