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Petersen, A. C. (1843). "Beobachtungen des Cometen auf der Altonaer Sternwarte. Von Herrn Observator Ritter Petersen". Astronomische Nachrichten (in German). 20 (10): 163. Bibcode:1843AN.....20..163P. doi:10.1002/asna.18430201003.
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