Comparative analysis of layered structures in empirical investor networks and cellphone communication networksPeng Wang, Jun-Chao Ma, Zhi-Qiang Jiang, Wei-Xing Zhou and Didier SornetteEPJ Data Sci., 9 1 (2020) 11DOI: https://doi.org/10.1140/epjds/s13688-020-00230-1