def METHOD_NAME(cls, filename: Path, data: str) -> dict:
    """Source heuristic for ABI/INFORM (ProQuest)"""
    result = {"confidence": 0.0}
    if "www.proquest.com" in data:  # nosec
        if data.count("www.proquest.com") >= data.count("\n@"):
            result["confidence"] = 1.0
    return result