How to use the manubot.cite.citation_to_citeproc function in manubot

requests_cache.install_cache(args.requests_cache_path, include_get_headers=True)
    cache = requests_cache.get_cache()
    if args.clear_requests_cache:
        logging.info('Clearing requests-cache')
        requests_cache.clear()
    logging.info(f'requests-cache starting with {len(cache.responses)} cached responses')

    csl_items = list()
    failures = list()
    for citation in citation_df.standard_citation.unique():
        if citation in manual_refs:
            csl_items.append(manual_refs[citation])
            continue
        try:
            citeproc = citation_to_citeproc(citation)
            csl_items.append(citeproc)
        except Exception as error:
            logging.exception(f'Citeproc retrieval failure for {citation}')
            failures.append(citation)

    logging.info(f'requests-cache finished with {len(cache.responses)} cached responses')
    requests_cache.uninstall_cache()

    if failures:
        message = 'Citeproc retrieval failed for:\n{}'.format(
            '\n'.join(failures))
        logging.error(message)

    # Write JSON CSL bibliography for Pandoc.
    with args.references_path.open('w') as write_file:
        json.dump(csl_items, write_file, indent=2, ensure_ascii=False)