# Europe PMC citations and references

For one article, lists the articles that cite it ('citations') or the works it cites ('references'), with title, authors, journal, year and their own citation. Needs relation and id.

For one article, lists the articles that cite it ('citations') or the works it cites ('references'), with title, authors, journal, year and their own citation counts. Identify the article by source (MED for PMIDs, PMC, PPR for preprints) and id.

- Tool ID: `europepmc/citations`
- Provider: [Europe PMC](/providers/europepmc.md)
- Capability: [Scientific papers](/tools/knowledge/papers.md)
- Price: no charge per call
- Authentication: an authorised Agentik workspace is required for execution, including zero-price tools.

## Pricing contract

No charge per call. A workspace is still needed so your agent can call it.


```json
{
  "model": "per_call",
  "amountUsd": 0
}
```

## Complete input schema


```json
{
  "type": "object",
  "properties": {
    "relation": {
      "type": "string",
      "enum": [
        "citations",
        "references"
      ],
      "description": "'citations' (who cites it) or 'references' (what it cites)"
    },
    "source": {
      "type": "string",
      "enum": [
        "MED",
        "PMC",
        "PPR",
        "AGR",
        "CBA",
        "CTX",
        "ETH",
        "HIR",
        "PAT"
      ],
      "default": "MED",
      "description": "Id source, e.g. 'MED' for a PMID"
    },
    "id": {
      "type": "string",
      "pattern": "^[A-Za-z0-9]{1,20}$",
      "description": "Article id in that source, e.g. '33567185'"
    },
    "page": {
      "type": "integer",
      "minimum": 1,
      "maximum": 1000,
      "default": 1,
      "description": "Page number, e.g. 1"
    },
    "page_size": {
      "type": "integer",
      "minimum": 1,
      "maximum": 100,
      "default": 25,
      "description": "Results per page, e.g. 25"
    }
  },
  "required": [
    "relation",
    "id"
  ],
  "additionalProperties": false
}
```

## Published example

This is the provider tool’s published example. Replace example values with the user’s requested inputs, respecting the schema; do not execute an example merely to test a connection.


```json
{
  "tool_id": "europepmc/citations",
  "input": {
    "relation": "citations",
    "source": "MED",
    "id": "33567185",
    "page_size": 3
  }
}
```

## Execute and retrieve

Inspect again before execution, explain the price and obtain the required authority. Use MCP run_tool or POST /v1/run with this tool ID, valid input and an idempotency key. Save the returned run ID and follow the actual state. If Agentik answers that the tool is temporarily unavailable, do not retry it blindly; use discovery to propose an alternative.

A partial or uncertain result can still have consumed provider resources. Consult [billing](/docs/billing.md), [idempotency](/docs/idempotency.md) and [asynchronous results](/docs/async.md).

Licence: EMBL-EBI terms of use (bibliographic metadata).

Attribution: Data from Europe PMC (EMBL-EBI).

[Provider documentation](https://europepmc.org/RestfulWebService)

[REST inspection](https://api.agentik.cc/v1/tools/europepmc/citations) · [OpenAPI](/openapi.json) · [Connection guide](/connect.md)

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[HTML page](/providers/europepmc/citations) · [Agent index](/llms.txt)