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Optimal and near-optimal policies for lost sales inventory models with at most one replenishment order outstanding
Hill, Roger M., (2006)
Can-order policies for coordinated inventory replenishment with Erlang distributed times between ordering
Schultz, Helle, (1999)
Optimal and approximate (Q, r) inventory policies with lost sales and gamma-distributed lead time
Johansen, Soren Glud, (1993)