21
22
23
Published in 2007
Repository
24
25
Published in 2012
Repository
26
27
Published in 2010
Repository
28
Published in 1985
Repository
29
30
31
32
Published in 1985
Repository
33
Published in 2010
Repository
34
Published in 1998
Repository
35
36
Published in 2010
Repository
37
by Cuesta Subía, Hugo Xavier; Monteros J., Cecilia; Montesdeoca, Fabián; Unda Galarza, José Reinaldo; Carrera, Efrén; Yumisaca, Fausto; Reinoso R., Iván A.; Yánez Navarrete, Zoila Elizabeth
Published in 2011
Repository
38
Published in 2011
Repository
39
40