Fraser, Morgan; Maund, Justyn R.; Smartt, Stephen J.; Kotak, Rubina; Lawrence, Andy; Bruce, Alastair; Valenti, Stefano; Yuan, Fang et al.. (2014-03-21). «On the progenitor of the Type IIP SN 2013ej in M74»Monthly Notices of the Royal Astronomical Society: Letters 439 (1): L56–L60. doi:10.1093/mnrasl/slt179. ISSN1745-3933. (Noiz kontsultatua: 2021-06-03).
Fraser, Morgan; Maund, Justyn R.; Smartt, Stephen J.; Kotak, Rubina; Lawrence, Andy; Bruce, Alastair; Valenti, Stefano; Yuan, Fang et al.. (2014-03-21). «On the progenitor of the Type IIP SN 2013ej in M74»Monthly Notices of the Royal Astronomical Society: Letters 439 (1): L56–L60. doi:10.1093/mnrasl/slt179. ISSN1745-3933. (Noiz kontsultatua: 2021-06-03).
Fraser, Morgan; Maund, Justyn R.; Smartt, Stephen J.; Kotak, Rubina; Lawrence, Andy; Bruce, Alastair; Valenti, Stefano; Yuan, Fang et al.. (2014-03-21). «On the progenitor of the Type IIP SN 2013ej in M74»Monthly Notices of the Royal Astronomical Society: Letters 439 (1): L56–L60. doi:10.1093/mnrasl/slt179. ISSN1745-3933. (Noiz kontsultatua: 2021-06-03).