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Optimal ordering policies with two suppliers when lead times and demands are all stochastic
Lau, Hon-Shiang, (1993)
An efficient method for determining the waiting time distribution of queues
Lau, Hon-Shiang, (1976)
An improved (Q, R) formulation when the stockout cost is incurred on a per-stockout basis
Lau, Amy Hing Ling, (2008)