Columbia subject headings:
Dissertations, Academic--Spain--Abstracts.
Universidad Complutense de Madrid--Dissertations--Abstracts.
Harvard subject headings:
Dissertations, Academic--Spain--Abstracts.
Universidad Complutense de Madrid--Dissertations--Abstracts.
Princeton subject headings:
Abstracts.
Dissertations, Academic--Spain--Abstracts.
Universidad Complutense de Madrid--Dissertations--Abstracts.