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Ryder, S. et al. Ultraviolet Detection of the Binary Companion to the Type IIb SN 2001ig. The Astrophysical Journal. 2018, roč. 856, s. 83. Dostupné online. doi:10.3847/1538-4357/aaaf1e.
Soria, R. et al. Multiband Study of NGC 7424 and its Two Newly-discovered ULXs. Monthly Notices of the Royal Astronomical Society. 2006, roč. 370, s. 1666–1676. Dostupné online. doi:10.1111/j.1365-2966.2006.10629.x.