[2] viXra:2005.0178 submitted on 2020-05-17 00:34:00, (280 unique-IP downloads)
Authors: Lyubka Ilieva
Category: Economics and Finance
[1] viXra:2005.0176 submitted on 2020-05-17 00:41:38, (241 unique-IP downloads)
Authors: Lyubka Ilieva
Category: Economics and Finance