{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T17:30:39Z","timestamp":1784136639272,"version":"3.55.0"},"reference-count":0,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2015,9,1]],"date-time":"2015-09-01T00:00:00Z","timestamp":1441065600000},"content-version":"tdm","delay-in-days":5356,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["MLQ - Math. Log. Quart."],"published-print":{"date-parts":[[2001,1]]},"DOI":"10.1002\/1521-3870(200101)47:1<51::aid-malq51>3.0.co;2-w","type":"journal-article","created":{"date-parts":[[2002,9,10]],"date-time":"2002-09-10T20:38:12Z","timestamp":1031690292000},"page":"51-65","source":"Crossref","is-referenced-by-count":24,"title":["The Arithmetical Hierarchy of Real Numbers"],"prefix":"10.1002","volume":"47","author":[{"given":"Xizhong","family":"Zheng","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Klaus","family":"Weihrauch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","container-title":["MLQ"],"original-title":[],"link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1002%2F1521-3870(200101)47:1%3C51::AID-MALQ51%3E3.0.CO;2-W","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1002\/1521-3870(200101)47:1%3C51::AID-MALQ51%3E3.0.CO;2-W","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,7,1]],"date-time":"2021-07-01T03:54:24Z","timestamp":1625111664000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/1521-3870(200101)47:1<51::AID-MALQ51>3.0.CO;2-W"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2001,1]]},"references-count":0,"journal-issue":{"issue":"1"},"URL":"https:\/\/doi.org\/10.1002\/1521-3870(200101)47:1<51::aid-malq51>3.0.co;2-w","relation":{},"ISSN":["0942-5616","1521-3870"],"issn-type":[{"value":"0942-5616","type":"print"},{"value":"1521-3870","type":"electronic"}],"subject":[],"published":{"date-parts":[[2001,1]]}}}