### 1.7. Details about a paper's references `GET /graph/v1/paper/{paper_id}/references`

返回这篇论文引用的论文。

| 参数 | 必填 | 说明 |
|---|---|---|
| `paper_id` | 是 | 路径参数，写法同 1.5 |
| `offset` / `limit` | 否 | 同 1.6 |
| `fields` | 否 | 邻居字段用 `citedPaper.title` |

```bash
curl "https://fetchpaper.com/graph/v1/paper/204e3073870fae3d05bcbc2f6a8e263d9b72e776/references?limit=1&fields=title,year,citationCount"
```

```json
{"offset": 0, "next": 1, "data": [{"citedPaper": {"paperId": "98445f4172659ec5e891e031d8202c102135c644",
 "title": "Neural Machine Translation in Linear Time", "year": 2016, "citationCount": 592}}]}
```

- 每篇被引论文包在 `citedPaper` 里；引用对象字段、去重与翻页规则与 1.6 相同。
- `publicationDateOrYear` 只支持 `citations`，`references` 传了忽略。