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Eracleous, Michael; Hwang, Jason A.; Flohic, Hélène M. L. G. (March 2010). ”Spectral Energy Distributions of Weak Active Galactic Nuclei Associated with Low-Ionization Nuclear Emission Regions”. The Astrophysical Journal Supplement 187 (1): sid. 135–148. doi:10.1088/0067-0049/187/1/135. Bibcode: 2010ApJS..187..135E.
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Thilker, David A.; Donovan, Jennifer; Schiminovich, David; Bianchi, Luciana; Boissier, Samuel; Gil de Paz, Armando; Madore, Barry F.; Martin, D. Christopher; et al. (2009). ”Massive star formation within the Leo 'primordial' ring”. Nature 457 (7232): sid. 990–993. doi:10.1038/nature07780. PMID 19225520. Bibcode: 2009Natur.457..990T.