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Radick, R. R.; Africano, J. L.; Flores, M. R.; Klimke, D. A.; Tyson, E. T. (1982). "Cloudcroft occultation summary. II - April 1980-December 1981". The Astronomical Journal. 87: 1874. Bibcode:1982AJ.....87.1874R. doi:10.1086/113277. ISSN0004-6256.
Radick, R. R.; Africano, J. L.; Flores, M. R.; Klimke, D. A.; Tyson, E. T. (1982). "Cloudcroft occultation summary. II - April 1980-December 1981". The Astronomical Journal. 87: 1874. Bibcode:1982AJ.....87.1874R. doi:10.1086/113277. ISSN0004-6256.