Whitt, Ward - In: Management Science 51 (2005) 2, pp. 221-235
distributed (IID) service times with a general distribution, s servers, r extra waiting spaces and IID customer abandonment times …-dependent abandonment rates. After making an additional approximation, steady-state waiting-time distributions are characterized via their … levels, e.g., the minimum number of servers needed to guarantee that, first, the abandonment rate is below any specified …