@techreport{KrumkeRambauWeider2000, author = {Sven Krumke and J{\"o}rg Rambau and Steffen Weider}, title = {An Approximation Algorithm for the Non-Preemptive Capacitated Dial-a-Ride Problem}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {00-53}, language = {eng}, year = {2000} }