Before revision:  Considering these measures as stochastic processes in a stationary environment (defined by the arrival processes, message processing times and admission controls in bufferless systems)  we characterize their distributions using the Palm inversion formula.
After revision:  Considering these measures as stochastic processes in a stationary environment (defined by the arrival processes, message processing times and admission controls in bufferless systems) , we characterize their distributions using the Palm inversion formula.