21
Published in 1991
Repository
22
Published in 1992
Repository
23
Published in 1982
Repository
24
25
Published in 1990
Repository
26
Published in 1998
Repository
27
Published in 1987
Repository
28
29
Published in 1997
Repository
30
by Nieto C., Carlos; Tapia B., César; Paredes, Nelly; Nieto E., Mercedes; Añazco R., Mario; Hidrobo U., Gabriela; Flor A., Efrén
Published in 2017
Repository
31
32
33
Published in 1991
Repository
34
Published in 1994
Repository
35
Published in 1983
Repository
36
37
38
39
Published in 1980
Repository
40