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The Pht-Pht-(infinity) Queueing System: Part I -- The Single Node
Nelson, Barry L., (2004)
The MAPt/Pht/∞ queueing system and multiclass [MAPT/PHT/∞]k queueing network
Gerhardt, Ira, (2017)
Approximating nonstationary ph(t)⧸ph(t)⧸1⧸c queueing systems
Ong, Kim L., (1988)