SIMBAD references

1964AJ.....69..759Z - Astron. J., 69, 759-761 (1964)

Supernova 1956a of type I in NGC 3992.

ZWICKY F. and KARPOWICZ M.

Journal keyword(s):

Nomenclature: Fig.1, Table I: [ZK64] NN (Nos 1-21).

Simbad objects: 23

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