Roca, A. XXII Barcelona 1990, ESC Proceedings, External Organizations;
Mayer-Rosa, D. XXII Barcelona 1990, ESC Proceedings, External Organizations;
http://bib.gfz-potsdam.de/pub/esc/esc-22-1-ocr.pdf (Any fulltext)
http://bib.gfz-potsdam.de/pub/esc/esc-22-1.pdf (Any fulltext)
Roca, A., Mayer-Rosa, D. (Eds.)(1990): XXII General Assembly European Seismological Commission Barcelona, 17-22 September 1990 (Volume 1): Proceedings and Activity Report 1988-1990, (ESC-Proceedings ; 22.1), Barcelona, 461 p.