[2] viXra:2008.0040 submitted on 2020-08-07 08:23:40, (171 unique-IP downloads)
Authors: Xianbo Wu
Category: Social Science
[1] viXra:2007.0201 submitted on 2020-07-25 11:12:22, (178 unique-IP downloads)
Authors: Xianbo Wu
Category: Social Science