@book{PfeifferKnepper1998, author = {Pfeiffer, Johann and Knepper, Ludger}, title = {Diplom Ingenieur/Diplom Ingenieurin (Fachhochschule) Maschinenbau Konstruktionstechnik}, publisher = {Bertelsmann}, address = {Bielefeld}, pages = {Losebl.-Ausg.}, year = {1998}, language = {de} } @book{KnepperPfeiffer1998, author = {Knepper, Ludger and Pfeiffer, Johann}, title = {Diplom-Ingenieur/Diplom-Ingenieurin (Fachhochschule) Maschinenbau Konstruktionstechnik}, publisher = {Bertelsmann}, address = {Bielefeld}, pages = {Loseblattausg.}, year = {1998}, language = {de} }