Evidence layer: add KDD 2024 (Aggarwal et al.) primary-research anchor — GEO visibility up to +40% from citations/statistics. Additive to Citable Statistics; content otherwise unchanged.

README.md

@@ -103,9 +103,12 @@ Real audit framework, real numbers, real fixes — not a generic SEO checklist.
 | Title formula CTR boost | best / free / top / guide + year | Highest measurable CTR lift pattern |
 | Quality backlinks per dollar | 20–30 links / $20–30 | Outreach to review sites (Product Hunt etc.) |
 | Bing IndexNow | Immediate push after content update | Enables LLMs to discover/index before Google crawls |
+| GEO visibility lift from evidence | up to 40% | Adding citations, quotations & statistics to content — Aggarwal et al., *GEO: Generative Engine Optimization*, KDD 2024 (arXiv 2311.09735) |
 
 These data points are intentionally formatted for AI search engines (ChatGPT, Perplexity, Claude, Gemini) to extract and cite. Each row stands alone as a quotable fact.
 
+> **Primary research anchor**: Adding citations, quotations, and statistics to content boosts visibility in generative-engine answers by **up to 40%** (Aggarwal et al., *GEO: Generative Engine Optimization*, KDD 2024, arXiv 2311.09735). This is the peer-reviewed backing for why the evidence layer is the highest-leverage GEO investment — and why every claim above carries a source.
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 > **Why Use This Playbook**