21
22
Published in 2003
Repository
23
Published in 2010
Repository
24
26
27
28
29
30
31
by Aguinaga Bósquez, Juan Pablo; Yánez G., Carlos; Valverde, Franklin; Alvarado Ochoa, Soraya Patricia
Published in 2012
Repository
32
33
34
Published in 2007
Repository
35
36
by Caviedes C., Mario; Yánez G., Carlos; Silva, Edison; Dobronsky, Jorge; Caicedo, Marlon; Zambrano Mendoza, José Luis; Heredia, Jorge
Published in 2002
Repository
37
38
39
40