Reference health
Efficiency and factors for agricultural use of sludge in circular Bulgarian economy
7/7 checkable references clean · checked 2026-08-03
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.
48 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 7 checked references that resolve
resolves10.17221/36/2018-SWR
Present restrictions of sewage sludge application in agriculture within the European Union
resolves10.3390/su12093686
Directions and Challenges in the Management of Municipal Sewage Sludge in Poland in the Context of the Circular Economy
resolves10.4236/ajps.2012.312209
Sewage Sludge: An Important Biological Resource for Sustainable Agriculture and Its Environmental Implications
The 48 references without a DOI — listed, not checked
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no DOI — not checkedSewage sludge produced during the COVID-19 epidemic can only be applied to fields after disinfection
no DOI — not checkedGoverning of Agrarian Sustainability
no DOI — not checkedMechanisms of governance of sustainble development
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no DOI — not checkedInstitutional environment and climate change impacts on sustainability of Bulgarian agriculture
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no DOI — not checkedA study on agrarian sustainability impact of governance modes in Bulgaria
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no DOI — not checkedAssessing Governance Aspect of Agrarian Sustainability in Bulgaria
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no DOI — not checkedConvergent analysis of waste water practices among EU countries
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no DOI — not checkedResources and Risks: Perceptions on the Application of Sewage Sludge on Agricultural Land in Sweden, a Case Study
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no DOI — not checkedWater Security in the Mediterranean Region, An International Evaluation of Management, Control, and Governance Approaches, Springer Science+Business Media B.V. The European Green Deal
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