def get_relationships(self):
    return [{'parent_entity': 'Reference', 'parent_variable': 'identifier', 'child_entity': 'Annotation', 'child_variable': 'authorReference'}]
def get_relationships(self):
    return [{'parent_entity': 'Reference', 'parent_variable': 'identifier', 'child_entity': 'Annotation', 'child_variable': 'authorReference'}]