21
Published in 2001
Repository
22
Published in 1997
Repository
23
24
Published in 2010
Repository
25
26
by Oyarzún, Pedro J.; Gallegos, Patricio; Asaquibay, César; Forbes, Gregory; Ochoa L., José; Paucar, Betty; Prado, Marcelo; Revelo, Jorge; Sherwood, Stephen; Yumisaca, Fausto
Published in 2002
Repository
27
28
29
Published in 2010
Repository
30
Published in 1999
Repository
31
Published in 1999
Repository
32
by Revelo, Jorge; Viteri D., Pablo; Vásquez C., Wilson; Valverde, Franklin; León F., Juan; Gallegos, Patricio
Published in 2010
Repository
33
Published in 2002
Repository
34
35
Published in 1986
Repository
36
37
38
39
40