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https://relbib.de/search/results?filter[]=~author_facet:"Blanchette, Oliva 1929-2021"&filter[]=~author_facet:"Blum, Erhard 1950-"&filter[]=~language:"English"&filter[]=~language:"German"&filter[]=~relbib_notation_facet:"VA"&lookfor=((((13615526x OR 13659526x) OR ((((13845826x OR 13065826x) OR 13841856x) OR (13345326x OR 13384532x)) OR 13145806x)) OR ((((14245026x OR 19845029x) OR 12842026x) OR 17112426x) OR 14245902x)) OR (13384126x OR 13381226x))&type=AllFields