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https://relbib.de/search/results?filter[]=is_open_access:"non-open-access"&filter[]=~author_facet:"Dürr, Alfred 1918-2011"&filter[]=~author_facet:"Gurlitt, Wilibald 1889-1963"&filter[]=~language:"German"&filter[]=~publisher_facet:"Bärenreiter"&lookfor=((((((11855400x OR (11855347x OR 11859348x)) OR ((11880698x OR 11853596x) OR 11859382x)) OR 11850021x) OR 11854523x) OR (11850553x OR 16750553x)) OR 11860922x)&type=AllFields