21
22
23
Published in 2011
Repository
24
by Gallegos, Patricio; Castillo C., Carmen; Baez Cevallos, Francisco; Suquillo, Jovanny; Sevillano, Carlos; Asaquibay, César; Meneses, A.; Chulde, F.
Published in 2010
Repository
25
26
Published in 2012
Repository
27
28
by Ochoa L., José; Gallegos, Patricio; Asaquibay, César; Insuasti, María Luisa; Galarza, V.; Jaramillo, A.; Vizuete, B.; Viera, William; Viteri, J.; Williams, Roger; Carrasco, I.; Martínez, Aníbal; Ayala, G.
Published in 2001
Repository
29
30
Published in 2001
Repository
31
32
Published in 1997
Repository
33
34
Published in 2003
Repository
35
36
37
Published in 2010
Repository
38
39
40