xref/coverage_stats/coverage_summary.json

{
  "total_unique_dois": 293123121,
  "per_source": {
    "S2AG": 133433468,
    "OpenAlex": 292147200,
    "SciSciNet": 158528096,
    "PWC": 141117,
    "RetWatch": 60074,
    "Patents": 312929
  },
  "n_combinations": 34,
  "generated_at": "2026-02-17T13:24:29"
}