Buchheim, Robert K.; Gartrelle, Gordon M. (July 2011). “846 Lipperta: A Very Slow Rotator”. The Minor Planet Bulletin38 (3): 151-153. Bibcode: 2011MPBu...38..151B. ISSN1052-8091.
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Buchheim, Robert K.; Gartrelle, Gordon M. (July 2011). “846 Lipperta: A Very Slow Rotator”. The Minor Planet Bulletin38 (3): 151-153. Bibcode: 2011MPBu...38..151B. ISSN1052-8091.