NGC 972 (Italian Wikipedia)

Analysis of information sources in references of the Wikipedia article "NGC 972" in Italian language version.

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(EN) J. Vennik e G.M. Richter, Surface Photometry of Low-Surface-Brightness Galaxies in the Area of the NGC 972 Group of Galaxies, in Symposium - International Astronomical Union, vol. 161, 1994, pp. 553–555, DOI:10.1017/S0074180900048075. URL consultato il 19 maggio 2021.

(EN) J. Vennik e G.M. Richter, Surface Photometry of Low-Surface-Brightness Galaxies in the Area of the NGC 972 Group of Galaxies, in Symposium - International Astronomical Union, vol. 161, 1994, pp. 553–555, DOI:10.1017/S0074180900048075. URL consultato il 19 maggio 2021.
(DE) J. Vennik e G. M. Richter, Photometry of groups of galaxies. II. The NGC 972 group, in Astronomische Nachrichten, vol. 315, n. 3, 1994, pp. 245–251, DOI:10.1002/asna.2103150306. URL consultato il 19 maggio 2021.

(DE) J. Vennik e G. M. Richter, Photometry of groups of galaxies. II. The NGC 972 group, in Astronomische Nachrichten, vol. 315, n. 3, 1994, pp. 245–251, DOI:10.1002/asna.2103150306. URL consultato il 19 maggio 2021.