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Improvement of sewage sludge anaerobic digestion through synergistic effect combined trace elements enhancer with enzyme pretreatment and microbial community response

https://doi.org/10.1016/j.chemosphere.2021.131356
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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.

3 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 42 checked references that resolve
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The 3 references without a DOI — listed, not checked
no DOI — not checked10.1016/j.chemosphere.2021.131356_bib1
no DOI — not checkedProtein hydrolysis and fermentation under methanogenic and acidifying conditions
no DOI — not checkedComparing the mechanisms of ZVI and Fe 3 O 4 for promoting waste-activated sludge digestion
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