Showalter, M. R. Visual detection of 1981 S 13, Saturn's eighteenth satellite, and its role in the Encke gap. Nature. 1991, 351 (6329): 709. Bibcode:1991Natur.351..709S. doi:10.1038/351709a0.
Showalter, M. R. Visual detection of 1981 S 13, Saturn's eighteenth satellite, and its role in the Encke gap. Nature. 1991, 351 (6329): 709. Bibcode:1991Natur.351..709S. doi:10.1038/351709a0.