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Not a DOI

The resolution service at https://doi.org resolves DOIs. You have attempted to resolve mailto:takayoshi.oba@nao.ac.jp, which is not a DOI.

mailto:takayoshi.oba@nao.ac.jp may be a Handle (DOIs are a special sort of Handle). If mailto:takayoshi.oba@nao.ac.jp is a valid Handle you should be able to resolve it at https://hdl.handle.net.

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