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skills/ml-pipeline/references/README.md

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+# References -- ml-feature-engineering
+
+Place reference materials here:
+
+- Research papers on feature engineering for financial ML.
+- Configuration templates and example pipeline configs.
+- Links to external documentation (scikit-learn, SHAP, Optuna, etc.).
+
+## Key References
+
+- Lopez de Prado, *Advances in Financial Machine Learning* (2018).
+- Hastie, Tibshirani & Friedman, *The Elements of Statistical Learning*.
+- scikit-learn user guide: https://scikit-learn.org/stable/user_guide.html
+- SHAP documentation: https://shap.readthedocs.io/