[2] viXra:2005.0178 submitted on 2020-05-17 00:34:00, (275 unique-IP downloads)
Authors: Lyubka Ilieva
Category: Economics and Finance
[1] viXra:2005.0176 submitted on 2020-05-17 00:41:38, (234 unique-IP downloads)
Authors: Lyubka Ilieva
Category: Economics and Finance