@misc{yamba2026purplesquareatlas,
  author = {Yamba, Christopher and {GPT-6.1 Sol Extra High}},
  title = {Purple Square Atlas: Geometry, Symmetry and Counting},
  date = {2026-10-10},
  year = {2026},
  note = {Author-published edition 1.0},
  url = {https://autodidactic-math-traveler.vercel.app/blog/purple-square-atlas/}
}