1
2
Published in 2003
Repository
3
4
Published in 1986
Repository
5
Published in 1988
Repository
6
Published in 2003
Repository
7
Published in 1988
Repository
8
Published in 1978
Repository
9
10
Published in 1989
Repository
11
Published in 1987
Repository
12
Published in 2003
Repository
13
Published in 1999
Repository
14
by Caviedes C., Mario; Yánez G., Carlos; Silva, Edison; Dobronsky, Jorge; Caicedo, Marlon; Zambrano Mendoza, José Luis; Heredia, Jorge
Published in 2002
Repository
15
16
17
Published in 1984
Repository
18
Published in 1990
Repository
19
20