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      <journal>
        <journal_metadata language="en">
          <full_title>Geophysical Journal International</full_title>
          <issn media_type="electronic">1365-246X</issn>
          <issn media_type="print">0956-540X</issn>
        </journal_metadata>
        <journal_issue>
          <publication_date media_type="other">
            <month>05</month>
            <year>2015</year>
          </publication_date>
          <publication_date media_type="print">
            <month>05</month>
            <day>01</day>
            <year>2015</year>
          </publication_date>
          <publication_date media_type="online">
            <month>03</month>
            <day>11</day>
            <year>2015</year>
          </publication_date>
          <journal_volume>
            <volume>201</volume>
          </journal_volume>
          <issue>2</issue>
        </journal_issue>
        <journal_article publication_type="full_text">
          <titles>
            <title>The adjoint-state method for the downward continuation of the geomagnetic field</title>
          </titles>
          <contributors>
            <person_name sequence="first" contributor_role="author">
              <given_name>J. M.</given_name>
              <surname>Hagedoorn</surname>
            </person_name>
            <person_name sequence="additional" contributor_role="author">
              <given_name>Z.</given_name>
              <surname>Martinec</surname>
            </person_name>
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          <publication_date media_type="other">
            <month>05</month>
            <year>2015</year>
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          <publication_date media_type="print">
            <month>05</month>
            <day>01</day>
            <year>2015</year>
          </publication_date>
          <publication_date media_type="online">
            <month>03</month>
            <day>11</day>
            <year>2015</year>
          </publication_date>
          <pages>
            <first_page>724</first_page>
            <last_page>740</last_page>
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          <doi_data>
            <doi>10.1093/gji/ggv049</doi>
            <resource>http://academic.oup.com/gji/article/201/2/724/575596/The-adjointstate-method-for-the-downward</resource>
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