@book{Poetzsch, author = {Poetzsch, Eleonore}, title = {Information Retrieval}, edition = {3., {\"u}berarb.}, publisher = {Verl. f{\"u}r Berlin-Brandenburg}, address = {Potsdam}, isbn = {3-935035-40-3}, pages = {232}, subject = {Information Retrieval}, language = {de} }