N-period contracts with ordering constraints and total minimum commitments: Optimal and heuristic solutions. - Ronald S. Tibben-Lembke (Eur. J. Oper. Res., 2004)

An inventory model for delayed customization: A hybrid approach. - Ronald S. Tibben-Lembke; Yehuda Bassok (Eur. J. Oper. Res., 2005)