@book{Poetzsch, author = {Poetzsch, Eleonore}, title = {Wirtschaftsinformation}, publisher = {Verl. f{\"u}r Berlin-Brandenburg}, address = {Potsdam}, isbn = {3-935035-18-7}, pages = {342}, subject = {Wirtschaftinformation}, language = {de} } @book{Poetzsch, author = {Poetzsch, Eleonore}, title = {Information Retrieval}, edition = {2., v{\"o}llig neu bearb.}, publisher = {Verl. f{\"u}r Berlin-Brandenburg}, address = {Potsdam}, isbn = {3-935035-16-0}, pages = {238}, subject = {Information Retrieval}, language = {de} }