@article{BrandtBrandt2004, author = {Brandt, Andreas and Brandt, Manfred}, title = {On the two-class \$M/M/1\$ system under preemptive resume and impatience of the prioritized customers}, volume = {47}, journal = {Queueing Syst.}, pages = {147 -- 168}, year = {2004}, language = {en} }