?url_ver=Z39.88-2004&rft_id=10.1051%2Fe3sconf%2F202128704007&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Rajagopal%2C+R.&rft.aulast=Rajagopal&rft.aufirst=R.&rft.title=Preparation+of+Graphene+Oxide+from+Lignin+by+Gel+Combustion+Method+and+Its+Performance+as+Supercapacitor&rft.date=2021&rft.issn=25550403&rft.genre=proceeding