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参考
- Probabilistic Context-Free Grammars (PCFGs) (Notes). Michael Collins. Columbia University.
- Parsing, and Context-Free Grammars 1 (Slides). Michael Collins. Columbia University.
- Parsing, and Context-Free Grammars 2.1 (Slides). Michael Collins. Columbia University.
- Parsing, and Context-Free Grammars 2.2 (Slides). Michael Collins. Columbia University.
- Parsing, and Context-Free Grammars 3 (Slides). Michael Collins. Columbia University.