2007-6835 2007-6835 S2007-68352022000200263 10.21041/ra.v12i2.585 Cuba 00 08 2022 00 08 2022 12 2 263 278

2021 27 3 3 2006 64 5 5 357-62 2010 DIN EN 338:2016-07 2016 2019 2018 ISO 9709:2018 2018 2007 2011 63 521 521 13-22 2019 2007 59 506 506 123-30 2007 2018 33 2 2 117-32 2015 23 23 25-30 2020 30 1 1 43-52 2011 2021