A network topology approach to diagnose the shift of covariance structureNur Syahidah Yusoff, Noryanti Mohamad, Chuan Zun Liang, Shamshuritawati Sharif and Tan Lit KenMATEC Web Conf., 189 (2018) 03027DOI: https://doi.org/10.1051/matecconf/201818903027