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      "title_zh": "21.4 进一步阅读",
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      "title_zh": "21 中心势与氢原子",
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      "title_zh": "28.2 实克利福德代数",
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      "title_zh": "30.1 反交换生成元上多项式的格拉斯曼代数",
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      "title_zh": "31.1 伪经典系统的量子化",
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      "title_zh": "31.2 费米子的薛定谔表示：鬼场",
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      "title_zh": "36 多粒子系统：动量空间描述",
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