RelBib: Results for "(11850021x OR 11850553x)"
https://relbib.de/search/results?filter[]=era_facet:"1983"&filter[]=genre_facet:"Conference program"&filter[]=~geographic_facet:"Austria (Vienna)"&filter[]=~geographic_facet:"Leipzig"&lookfor=(11850021x OR 11850553x)&type=AllFields