Showalter, Mark R. (1991-06-27). "Visual detection of 1981S13, Saturn's eighteenth satellite, and its role in the Encke gap". Nature (به انگلیسی). 351 (6329): 709–713. Bibcode:1991Natur.351..709S. doi:10.1038/351709a0. S2CID4317496.
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Showalter, Mark R. (1991-06-27). "Visual detection of 1981S13, Saturn's eighteenth satellite, and its role in the Encke gap". Nature (به انگلیسی). 351 (6329): 709–713. Bibcode:1991Natur.351..709S. doi:10.1038/351709a0. S2CID4317496.
Showalter, Mark R. (1991-06-27). "Visual detection of 1981S13, Saturn's eighteenth satellite, and its role in the Encke gap". Nature (به انگلیسی). 351 (6329): 709–713. Bibcode:1991Natur.351..709S. doi:10.1038/351709a0. S2CID4317496.