> For the complete documentation index, see [llms.txt](https://doc.duaer.com/zh/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.duaer.com/zh/getting-started/opencitations.md).

# 在 Duaer 里查 OpenCitations 引用

在 Duaer 里：从开放的 OpenCitations 索引查某 DOI 的施引文献或其参考文献，按时间从新到旧，含标题、作者、期刊与自引标记。一次成功查询用 1 额度。
## 能拿到什么

Duaer 数据市场里的「OpenCitations 引用」：从开放的 OpenCitations 索引查某 DOI 的施引文献或其参考文献，按时间从新到旧，含标题、作者、期刊与自引标记。查到结果时用 1 额度，结果交给数字组织的下一个节点。

从节点创建器选 Duaer 数据 → OpenCitations 引用，或打开 [数据市场](/zh/getting-started/data-market.md)。相关：[papers](/zh/getting-started/papers.md)、[crossref](/zh/getting-started/crossref.md)、[icite](/zh/getting-started/icite.md)。

## 适合做什么

- 查看最近有谁、在哪些期刊引用了一篇论文。
- 列出一篇论文的参考文献，追溯其来源。

## 在画布里检索

1. 打开节点创建器，选 Duaer 数据 → OpenCitations。
2. 填 DOI（如 10.1038/nature12373）；Direction 可选 citations（施引）或 references（参考文献）。
3. Limit 默认 10，最大 20。执行。

查到结果才扣 1 额度；没有结果、输入有误或上游失败都不扣。

## 用 API 调用

- GET https://api.duaer.com/v1/data/opencitations?doi=10.1038/nature12373&limit=10
- Authorization: Bearer <Duaer key>

下方是与数据市场「复制技能」相同的英文技能，含参数、示例与返回字段。

## 调用技能（英文）

与数据市场「复制技能」一致。

```
---
name: duaer-opencitations
description: >-
  Duaer OpenCitations. Papers that cite a DOI, or the papers it references, from the open OpenCitations index, newest first, with titles, authors, venue, and self-citation flag.
  One successful search uses 1 Duaer credit.
---

# Duaer OpenCitations

Duaer OpenCitations walks the citation graph of one paper using the open OpenCitations index and adds titles and authors from OpenCitations Meta.

## When to use

- See who cited a paper recently and in which journals.
- List the references of a paper to follow its sources.

## When not to use

- Searching papers by words. Use https://skills.duaer.com/papers.md.
- Complete counts for every paper. Open indexes miss some publishers.

## Call

`GET https://api.duaer.com/v1/data/opencitations?doi=10.1038/nature12373&limit=10`

Header: `Authorization: Bearer <Duaer key>`

Use an account key or a model API key.

Get a Duaer key: https://skills.duaer.com/keys.md

## Parameters

Provide `doi`.

- `doi` — DOI of the paper, such as 10.1038/nature12373.
- `direction` — Optional. citations (who cites it) or references (what it cites). Default citations.
- `limit` — Optional. Rows to return, from 1 to 20. Default 10.

## Examples

- `GET https://api.duaer.com/v1/data/opencitations?doi=10.1038/nature12373&limit=10` — the ten newest citing papers.
- `GET https://api.duaer.com/v1/data/opencitations?doi=10.1038/nature12373&direction=references` — what the paper cites.

## Result

The response is `{ "items": [...] }`. Each item has `source`, `title`, `url`, and `summary`, plus:

- `doi` — DOI of the citing or cited paper.
- `direction` — citing or cited, relative to your DOI.
- `authors`, `venue`, `published`, `type` — metadata from OpenCitations Meta.
- `selfCitation` — true when authors or journal overlap.

Fields without a value are left out.

## Credits

A search that returns at least one row uses 1 credit.
An empty search, a search that finds nothing, or a failed search uses 0.
Wrong input returns 400 with a message and uses 0.
No remaining credits returns 402 and does not search.
A missing key returns 401.

## Related

- https://skills.duaer.com/papers.md
- https://skills.duaer.com/crossref.md
- https://skills.duaer.com/icite.md

```
## Questions

### Duaer 的OpenCitations 引用检索扣多少额度？

查到结果时扣 1 额度；没有结果或出错不扣。

### Duaer OpenCitations 能覆盖全部引用吗？

不能。它覆盖 Crossref 等来源的开放引用数据，部分出版社未公开参考文献。

## 相关

- [在 Duaer 里检索论文](https://doc.duaer.com/zh/getting-started/papers.md)
- [在 Duaer 里检索 Crossref](https://doc.duaer.com/zh/getting-started/crossref.md)
- [在 Duaer 里检索 iCite](https://doc.duaer.com/zh/getting-started/icite.md)