@book{Poetzsch, author = {Poetzsch, Eleonore}, title = {Information Retrieval}, edition = {4., v{\"o}llig neu bearb. und erw.}, publisher = {Verl. f{\"u}r Berlin-Brandenburg}, address = {Potsdam}, isbn = {3-935035-75-6}, pages = {369}, subject = {Information Retrieval}, language = {de} }