What mythology are Percy Jackson's books inspired by?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q213167', 'id': 0, 'label': 'Percy Jackson & the Olympians'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q5027225', 'id': 1, 'label': 'Camp Half-Blood chronicles'}], 'links': [{'name_': 'P527', 'source': 1, 'target': 0, 'label': 'has part(s)'}]}