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Sebring, P. B. Haystack Observatory, Northeast Radio Observatory Corporation, Westford, Massachusetts. Observatory report covering the period from 1 July 1970 through 30 June 1971. Bulletin of the Astronomical Society. 1972, 4: 51. Bibcode:1972BAAS....4...51S.使用|accessdate=需要含有|url= (帮助)