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https://relbib.de/search/results?filter[]=is_open_access:"non-open-access"&filter[]=~author_facet:"Blum, Erhard 1950-"&filter[]=~language:"German"&lookfor=((((13188526x OR 13186226x) OR (((13845826x OR 13841856x) OR 13345326x) OR 13145806x)) OR ((((17845026x OR 19845029x) OR 12040026x) OR 17145426x) OR 14245902x)) OR 13381226x)&type=AllFields