1
Published: 1993;, 1993.
2
Published: 1991;, 1991.
3
Published: 1981;, 1981.
Superior document: Cuadernos del CES ; 30
4
Published: 1982;, 1982.
5
Published: 1986-
6
Published: 1998;, 2000.
7
Published: 1982;, 1982.
8
Published: 1993;, 1988.
9
Published: 1991;, 1991.
10
Published: 1991;, 2001.