21
22
23
24
by Paucar, Betty; Gallegos, Patricio; Nieto C., Carlos; Córdova, Juan J.; Rodríguez I., Luis F.; Ochoa L., José; Williams, Roger
Published in 2000
Repository
25
Published in 2007
Repository
26
Published in 2002
Repository
27
28
29
30
Published in 2000
Repository
31
Published in 2003
Repository
32
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
33
Published in 2010
Repository
34
Published in 1999
Repository
35
Published in 2002
Repository
36
37
Published in 2012
Repository
38
39
40