def transform_covered_by(covered_by):
    """ Transform covered_by to references as in version 1.0 """
    new_references = []
    for ref in covered_by:
        new_ref = {}
        new_ref['verification'] = ref['verification_key']
        component_key = ref.get('component_key')
        system_key = ref.get('system_key')
        if component_key:
            new_ref['component'] = component_key
        if system_key:
            new_ref['system'] = system_key
        new_references.append(new_ref)
    return new_references