Reference health
New Series for GDP Per Capita, Per Worker, and Per Worker-Hour in Portugal, 1950-2007
4/4 checkable references clean · checked 2026-08-02
Every reference with a DOI in the deposited reference list resolved to a known work in Crossref or DataCite at the dated check, and none carried a retraction, withdrawal, or removal notice.
13 without a DOI — not checked. A reference deposited without a DOI is never matched by title or guessed at; it stays outside the checked set, and this line discloses that.
The 4 checked references that resolve
The 13 references without a DOI — listed, not checked
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no DOI — not checkedPopula��o
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no DOI — not checkedWorld Economy in the Twentieth Century
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work were clean at the dated check: each resolved to a known work in a public registry, and none
carried a retraction notice at that time. It says nothing about the quality, findings,
or importance of the work itself, and nothing about references deposited without a DOI.
checked 2026-08-02 — re-checked daily as this page is visited; titles and statuses come from Crossref and DataCite and are not part of the signed record
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