?url_ver=Z39.88-2004&rft_id=10.1088%2F1757-899X%2F291%2F1%2F012026&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=E.M.&rft.au=Nia%2C+E.M.&rft.aulast=Nia&rft.issn=17578981&rft.title=A+review+of+walking+energy+harvesting+using+piezoelectric+materials&rft.date=2018&rft.genre=proceeding