@techreport{ZymolkaKosterWessaely2002, author = {Adrian Zymolka and Arie M.C.A. Koster and Roland Wess{\"a}ly}, title = {Transparent optical network design with sparse wavelength conversion}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {02-34}, language = {eng}, year = {2002} }