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Niels Bohr Nielsen Holdings Nielsen Ratings Niels Henrik Abel Nielsen Corporation Niels Gade Niels Kaj Jerne Nielsen Media Research Niels Ryberg Finsen Niels AagaardTài liệu tham khảo
WikiPedia: Nielsen_SoundScan http://www.hiphopdx.com/index/editorials/id.1021/t... http://query.nytimes.com/gst/fullpage.html?res=9D0... http://www.soundscan.com/