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References
- ↑ Kronk, Gary W. (2003). "C/1890 V1 (Zona)". Cometography: A Catalog of Comets. Vol. 2: 1800–1899. Cambridge University Press. pp. 658–660. ISBN 0521585058.
- ↑ Osservazioni della Cometa 1890 IV (Zona Nov. 15)
