21
22
Published in 1989
Repository
23
Published in 2012
Repository
24
Published in 1994
Repository
25
26
Published in 1989
Repository
27
Published in 1990
Repository
28
Published in 1991
Repository
29
Published in 1994
Repository
30
31
Published in 1986
Repository
32
by Paucar, Betty; Gallegos, Patricio; Nieto C., Carlos; Córdova, Juan J.; Rodríguez I., Luis F.; Ochoa L., José; Williams, Roger
Published in 2000
Repository
33
Published in 1994
Repository
34
Published in 1991
Repository
35
36
37
38
Published in 1988
Repository
39
Published in 1991
Repository
40
Published in 1992
Repository