[scikit-learn] Original source for DecisionTreeClassifier Implementation

[Praveen Gollakota]

Hello,

I was curious if anyone has an original source or paper from which the
decision trees were implemented in scikit learn. I see general references
for Elements of Statistical Learning and other references but no specific
mention of which version of algorithm is actually implemented.

I couldn't find any references in
https://github.com/scikit-learn/scikit-learn/tree/master/sklearn/tree.

Thanks,
Praveen.
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