21
22
23
Published in 2003
Repository
24
Published in 2010
Repository
25
27
28
29
30
31
32
by Aguinaga Bósquez, Juan Pablo; Yánez G., Carlos; Valverde, Franklin; Alvarado Ochoa, Soraya Patricia
Published in 2012
Repository
33
34
35
Published in 2007
Repository
36
37
by Caviedes C., Mario; Yánez G., Carlos; Silva, Edison; Dobronsky, Jorge; Caicedo, Marlon; Zambrano Mendoza, José Luis; Heredia, Jorge
Published in 2002
Repository
38
39
40
Published in 2006
Repository