?url_ver=Z39.88-2004&rft_id=10.4028%2Fwww.scientific.net%2FAMR.403-408.4231&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=K.&rft.au=Ashraf%2C+K.&rft.aulast=Ashraf&rft.title=Advanced+Materials+Research&rft.date=2012&rft.isbn=9783037853122&rft.volume=403-40&rft.issn=10226680&rft.pages=4231-4234&rft.atitle=An+electromagnetic+frequency+increased+vibration+energy+harvester&rft.genre=article