NGC 521 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "NGC 521" in English language version.

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astronomy-mall.com

Szeidl, B.; Lovas, M. (1982). "Supernova in NGC 521". International Astronomical Union Circular (3724): 1. Bibcode:1982IAUC.3724....1S.
Baek, M.; Li, W.; Puckett, T.; Sostero, G.; Garzia, S. (2006). "Supernovae 2006D, 2006E, 2006F, 2006G, 2006H". International Astronomical Union Circular (8660): 1. Bibcode:2006IAUC.8660....1B.

Marsden, Brian G. (22 August 1966). "Circular No. 1966". Central Bureau for Astronomical Telegrams. Smithsonian Astrophysical Observatory. Retrieved 2 December 2024.