21
Published in 1988
Repository
22
Published in 1999
Repository
23
Published in 2010
Repository
24
25
Published in 2000
Repository
26
Published in 1998
Repository
27
28
by Mazón, Nelson; Peralta I., Eduardo; Murillo I., Angel; Falconí-Castillo, Esteban; Monar B., Carlos; Subía G., Cristian; Estrella Sandoval, Ana Paola; Pinzón Z., José
Published in 2007
Repository
29
30
31
32
33
34
Published in 2004
Repository
35