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Alejandro J. Olvera, Sanchayeeta Borthakur, Mansi Padave, Timothy Heckman, Hansung B. Gim, Brad Koplitz, Christopher Dupuis, Emmanuel Momjian et Rolf A. Jansen, «DIISC-IV. DIISCovery of Anomalously Low Metallicity HII Regions in NGC 99: Indirect Evidence of Gas Inflows», The Astrophysical Journal, vol.976, no2, , p.1-18 (DOI10.3847/1538-4357/ad8238, lire en ligne[PDF]).
Aryan Raj Tiwary, Aditya Kumar Gupta, Preetish Niket, Tapas Khanijo et Dr. Jyoti Gupta, «Determination of Metallicity of different Galaxies using
Image Processing and DeepLearning Algorithms», International Journal of Innovative Research in Engineering, vol.3, no4, , p.194-199 (ISSNNo: 2582-8746[à vérifier: ISSN invalide], lire en ligne[PDF]).