What Is SNIP (Source Normalized Impact per Paper)?
Learn how SNIP corrects for field-specific citation differences so journals across disciplines can be compared fairly.
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Journal Quartiles Explained
A clear explanation of Q1, Q2, Q3, and Q4 journal quartiles, how they are calculated, and why they vary by subject category.
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What Is the DOAJ (Directory of Open Access Journals) and Why It Matters
The DOAJ is a quality-verified whitelist of over 20,000 open access journals. Learn how its criteria work and why DOAJ listing signals legitimacy.
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What Is the Eigenfactor Score?
Explore the Eigenfactor Score: a network-based metric that measures a journal’s total influence on the scientific citation ecosystem.
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What Is an ISSN? Meaning, Format, and How Journals Get One
What an ISSN is, how the eight-digit format works, and what having an ISSN does — and does not — guarantee about a journal’s quality.