2550-6722
2550-6722
S2550-67222019000300048
10.37135/chk.002.09.04
Ecuador
00
12
2019
00
12
2019
9
48
56
[
CEFR
2018
]
[
2009
101
912-25
]
[
2017
40
3
3
291-309
]
[
2010
10th
]
[
1994
22
4
4
487-96
]
[
2004
]
[
2009
101
705-16
]
[
2007
]
[
2012
219-40
]
[
1996
]
[
1975
]
[
2009
101
662-70
]
[
2011
81
2
2
201-33
]
[
2004
649-71
]
[
2011
161-73
]
[
2003
]
[
2012
139-58
]
[
1995
]
[
1994
15
3
3
300-27
]
[
2009
73-84
]
[
2012
37-55
]
[
1999
37
177-95
]
[
2008
]
[
2003
]