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Co<sub>3</sub>O<sub>4–<i>x</i></sub>-Carbon@Fe<sub>2–<i>y</i></sub>Co<sub><i>y</i></sub>O<sub>3</sub> Heterostructural Hollow Polyhedrons for the Oxygen Evolution Reaction

https://doi.org/10.1021/acsami.7b09213
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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.

1 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.

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The 1 reference without a DOI — listed, not checked
no DOI — not checkedElectrodes of Conductive Metallic Oxides
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