1
World petroleum congress 0013: proceedings vol 0004: reserves, management, finance and general : Buenos-Aires, 1991
Book
1992
...GWA - Raw material economy, raw material policy...
2
The role of petroleum in sustainable development: seminar: proceedings : Penang, 07.01.91-11.01.91 /
Book
...GWA - Raw material economy, raw material policy...
3
DGMK Haupttagung, Vorträge. 1990 : Münster, 19.09.90-21.09.90.
Book
1990
...GWA - Raw material economy, raw material policy...