{"first_sentence": {"type": "/type/text", "value": "GSM the Global system for mobile Communication, is the world market leader for digital mobile communication systems with 62% market share, more than 70 million users and 251 networks in operation in 108 countries."}, "physical_format": "Hardcover", "subtitle": "Evolution Towards 3rd Generation Systems", "weight": "1.6 pounds", "languages": [{"key": "/l/eng"}], "type": {"key": "/type/edition"}, "publishers": ["Springer"], "number_of_pages": 372, "isbn_13": ["9780792383512"], "id": 10609294, "edition_name": "1 edition", "isbn_10": ["0792383516"], "publish_date": "December 31, 1998", "key": "/b/OL7810179M", "last_modified": {"type": "/type/datetime", "value": "2008-04-29 15:03:11.581851"}, "title": "GSM", "contributions": ["Z. Zvonar (Editor)", "Peter Jung (Editor)", "Karl Kammerlander (Editor)"], "subjects": ["Communications engineering / telecommunications", "Science/Mathematics", "Telecommunication (Engineering)", "Technology", "Technology & Industrial Arts", "Telecommunications", "Engineering - Electrical & Electronic", "Radio", "Technology / Engineering / Electrical", "Technology / Radio", "Technology : Engineering - Electrical & Electronic", "Global system for mobile commu", "Global system for mobile communications"], "physical_dimensions": "9.4 x 6.3 x 0.8 inches", "revision": 1}