def METHOD_NAME(self, citation_file_name):
    """Returns the citation file data."""
    if not citation_file_name:
        return {}
    # Fetch the citation file and load it
    content = self.retrieve_remote_file(citation_file_name)
    data = (
        yaml.safe_load(content.decoded.decode("utf-8"))
        if content is not None
        else None
    )
    return data