@techreport{BrandtBrandt2002, author = {Andreas Brandt and Manfred Brandt}, title = {On the Two-Class M/M/1 System under Preemptive Resume and Impatience of the Prioritized Customers}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {02-28}, language = {eng}, year = {2002} }