code: def record_extract_dois(record):
      
      record_dois = []
      tag = "024"
      ind1 = "7"
      ind2 = "_"
      subfield_source_code = "2"
      subfield_value_code = "a"
      identifiers_fields = record_get_field_instances(record, tag, ind1, ind2)
      for identifer_field in identifiers_fields:
          if 'doi' in [val.lower() for val in
                       field_get_subfield_values(identifer_field,
                                                 subfield_source_code)]:
              record_dois.extend(
                  field_get_subfield_values(
                      identifer_field,
                      subfield_value_code))
      return record_dois
docs: Return the DOI(s) of the record.