Geological Institute: Technical and Economical Studies, XIII Brasov 1972, ESC Proceedings, External Organizations;
http://bib.gfz-potsdam.de/pub/esc/esc-13-2-ocr.pdf (beliebiger Volltext)
http://bib.gfz-potsdam.de/pub/esc/esc-13-2.pdf (beliebiger Volltext)
Geological Institute: Technical and Economical Studies (Ed.)(1974): The XIIIth Genaral Assembly of the European Seismological Commission (Part 2): Brasov, 28th August - 5th September 1972, (Geophysical Prospecting: D Series ; 10)(ESC-Proceedings ; 13.2), Bucharest, 359 p.
