Given a list of all models in a graph, return JSON representing
    them and their properties.

    Args:
        references (seq[Model]) :
            A list of models to convert to JSON

    Returns:
        list

def references_json(references):
    ''' Given a list of all models in a graph, return JSON representing
    them and their properties.

    Args:
        references (seq[Model]) :
            A list of models to convert to JSON

    Returns:
        list

    '''

    references_json = []
    for r in references:
        ref = r.ref
        ref['attributes'] = r._to_json_like(include_defaults=False)
        references_json.append(ref)

    return references_json