{"isbn_13": ["9780387228372"], "last_modified": {"type": "/type/datetime", "value": "2008-04-29 13:35:46.87638"}, "languages": [{"key": "/l/eng"}], "publishers": ["Springer"], "number_of_pages": 204, "first_sentence": {"type": "/type/text", "value": "The theory of Fourier series is concerned with the question of whether a given periodic function, such as the plot of a heartbeat or the signal of a radio pulsar, can be written as a sum of simple waves."}, "isbn_10": ["0387228373"], "publish_date": "March 9, 2005", "key": "/b/OL7444447M", "authors": [{"key": "/a/OL2679998A"}], "title": "A First Course in Harmonic Analysis (Universitext)", "type": {"key": "/type/edition"}, "id": 10136522, "revision": 1}