@book{14888, author = {Haasis, Hans-Dietrich. and Kopfer, Herbert. and SpringerLink (Online service)}, title = {Operations Research Proceedings 2005}, publisher = {Springer-Verlag Berlin Heidelberg,}, year = {2006.}, address = {Berlin, Heidelberg :}, url = {http://dx.doi.org/10.1007/3-540-32539-5} }