[2] viXra:2009.0030 submitted on 2020-09-03 16:19:17, (192 unique-IP downloads)
Authors: Valentina MÎSLIȚCHI
Category: Education and Didactics
[1] viXra:2009.0023 submitted on 2020-09-03 16:33:25, (209 unique-IP downloads)
Authors: Valentina MÎSLIȚCHI
Category: Education and Didactics