@phdthesis{Hafer, author = {Hafer, Gebhard}, title = {Logistikinformations- und -steuerungssysteme f{\"u}r die dezentrale Fertigung mit Polen}, publisher = {Lang}, address = {Frankfurt am Main [u.a.]}, isbn = {3-631-33225-4}, pages = {235}, language = {de} } @book{SpechtHafer, author = {Specht, Dieter and Hafer, Gebhard}, title = {Instandhaltungsmethoden und -techniken; Instandhaltungscontrolling}, publisher = {Berlin; Heidelberg : Springer}, isbn = {3540593608}, language = {de} } @techreport{SpechtHafer, author = {Specht, Dieter and Hafer, Gebhard}, title = {Entwicklungspotentiale logistikorientierter Industrie in Brandenburg}, publisher = {Cottbus : BTU}, language = {de} }