Cryptology ePrint Archive: BibTeX Citation of Report 2021/1515

    author       = {Ziaur Rahman and
		    Ibrahim Khalil and
		    Xun Yi and
		    Mohammed Atiquzzaman},
    title        = {Blockchain-based Security Framework for Critical Industry 4.0 Cyber-physical System},
    howpublished = {Cryptology ePrint Archive, Report 2021/1515},
    year         = {2021},
    note         = {\url{}},

You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.

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