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“Library Catalog Entry Snapshot.” Accessed August 10, 2018. http://swb.bsz-bw.de/DB=2.1//PPNSET?PPN=490644910&INDEXSET=1&COOKIE=U998,Pbszgast,I17,B0728+,SY,NRecherche-DB,D2.1,E17138357-1,A,H,R193.197.31.15,FY.