http://ads.nao.ac.jp was formerly a mirror site of ADS (https://ui.adsabs.harvard.edu), but mirroring was discontinued in 2019, and access to each ADS paper's abstract is now redirected to the original ADS site.
This redirect is also scheduled to be discontinued in the near future.
If you have created links on your web pages using http://ads.nao.ac.jp, we recommend switching those links to the original ADS site.
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