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"V-Shape Property for Optimal Schedules with Monotone Penalty Functions" (with A.M. Krieger), Computers and Operations Research., (1992), Vol. 19,533-534.

"Stochastic Single Machine Scheduling with Quadratic Early-Tardy Penalties" (with J. Mittenthal), Operations Research (1993), Vol. 41, 786-796.

"A Hybrid Simulated Annealing Approach for Single Machine Scheduling Problems with Non Regular Penalty Functions" (with A. Rana and J. Mittenthal), Computers and Operations Research, (1993), Vol. 20, 103-111.

"Exact Economic Design of X charts for General Time and Control Distributions" (with J. Surtihadi), International Journal of Production Research, (1994), Vol. 32, 2287-2302.