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