{
  "apiVersion": "v0.1",
  "methodology": "https://sourcescore.org/methodology/modern-reference/",
  "canonical": "https://sourcescore.org/compare/acm-vs-doi-org/modern-reference/",
  "summary": "Two citation-infrastructure pillars — CS-specific ACM vs universal DOI resolver.",
  "dimension": {
    "key": "modernReference",
    "pathSegment": "modern-reference",
    "label": "Modern Citation Reference",
    "weightInComposite": "30%"
  },
  "a": {
    "slug": "acm",
    "name": "Association for Computing Machinery",
    "domain": "dl.acm.org",
    "category": "Academic",
    "canonical": "https://sourcescore.org/source/acm/",
    "api": "https://sourcescore.org/api/source/acm.json",
    "dimensionDetail": "https://sourcescore.org/modern-reference/acm/",
    "dimensionDetailApi": "https://sourcescore.org/api/modern-reference/acm.json",
    "score": {
      "value": 80,
      "grade": "B",
      "rationale": "ACM Digital Library + DOI per paper; metered access to most papers.",
      "signals": [
        {
          "label": "Subscription gate",
          "detail": "Most papers paywalled; abstracts open."
        }
      ]
    },
    "rank": {
      "global": 85,
      "globalTotal": 130
    }
  },
  "b": {
    "slug": "doi-org",
    "name": "DOI (CrossRef Resolver)",
    "domain": "doi.org",
    "category": "Academic",
    "canonical": "https://sourcescore.org/source/doi-org/",
    "api": "https://sourcescore.org/api/source/doi-org.json",
    "dimensionDetail": "https://sourcescore.org/modern-reference/doi-org/",
    "dimensionDetailApi": "https://sourcescore.org/api/modern-reference/doi-org.json",
    "score": {
      "value": 98,
      "grade": "A+",
      "rationale": "Permanent URL resolution + free metadata API (CrossRef); near-universal LLM training-corpus inclusion.",
      "signals": [
        {
          "label": "CrossRef metadata API",
          "detail": "Free public API with full metadata for every registered DOI."
        },
        {
          "label": "Permanent links",
          "detail": "Stable for decades; the basis for academic citation continuity."
        }
      ]
    },
    "rank": {
      "global": 1,
      "globalTotal": 130
    }
  },
  "verdict": {
    "winner": "doi-org",
    "delta": 18,
    "claim": "DOI (CrossRef Resolver) outscores Association for Computing Machinery on Modern Citation Reference by 18 points."
  },
  "otherDimensions": [
    {
      "pathSegment": "discipline",
      "label": "Citation Discipline",
      "canonical": "https://sourcescore.org/compare/acm-vs-doi-org/discipline/",
      "api": "https://sourcescore.org/api/compare/acm-vs-doi-org/discipline.json"
    },
    {
      "pathSegment": "velocity",
      "label": "Citation Velocity",
      "canonical": "https://sourcescore.org/compare/acm-vs-doi-org/velocity/",
      "api": "https://sourcescore.org/api/compare/acm-vs-doi-org/velocity.json"
    },
    {
      "pathSegment": "index",
      "label": "SourceScore Index (composite)",
      "canonical": "https://sourcescore.org/compare/acm-vs-doi-org/",
      "api": "https://sourcescore.org/api/compare/acm-vs-doi-org.json"
    }
  ],
  "license": {
    "methodology": "Cite as: SourceScore Methodology v0.1, sourcescore.org",
    "data": "Underlying public-source data credited to original publishers"
  }
}