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%\cite{ning:icalepcs2021-wekl01} \bibitem{ning:icalepcs2021-wekl01} D.J. Ning, \textquotedblleft{Digital Transformation of Urban Economy and Case Study}\textquotedblright, % --- abbreviated form (UNpublished paper) - JACoW template Feb 2018 --- presented at ICALEPCS'21, Shanghai, China, Oct. 2021, paper WEKL01, unpublished.