GeoNames
参考资料
- Ahlers, Dirk, , : 74–81, 2013
- Singh, Sanket Kumar; Rafiei, Davood, , (PDF): 1663–1672, 2018 [2020-03-16], (原始内容存档 (PDF)于2020-10-11)
- . Geonames.org. [2018-09-08]. (原始内容存档于2019-05-22).
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