0123-921X 0123-921X S0123-921X2021000300150 10.14483/22487638.18245 Colombia Colombia Colombia 00 09 2021 00 09 2021 25 69 150 170

2009 CENTELSA 2011 CODENSA S. A. 2011 2010 2001 23 4 4 305-12 2016 99 99 465-75 2016 IEEE 2018 2014 2014 33 1 1 Khanacademy 2018 2010 2016 2019 31 2 2 421-36 2015 2017 2009 2015 1996 2018 13 21 21 14886-92