21
Published in 1999
Repository
22
23
24
25
26
27
Published in 2012
Repository
28
Published in 1997
Repository
29
30
article
Published in 2012
Repository Revista Universidad Técnica de Manabi
31
article
Published in 2013
Repository Revista Universidad Técnica de Manabi
32
33
34
35
36
37
38
39
40