A cost model for N-version programming with imperfect debugging. - T. Bhaskar; U. D. Kumar (J. Oper. Res. Soc., 2006)

Spares provisioning under performance-based logistics contract: profit-centric approach. - David R. Nowicki; U. D. Kumar; Harold J. Steudel; Dinesh Verma (J. Oper. Res. Soc., 2008)