1. QM and OM Area; Indian Institute of Management Kozhikode; Kozhikode Kerala India
2. Production, Operations & Decision Sciences Area, XLRI Jamshedpur; School of Management; Jharkhand India
3. Department of Information Systems, Statistics and Management Science; University of Alabama Tuscaloosa; Tuscaloosa AL USA
4. Part of the work was done at the Department of Statistics; University of Pretoria; South Africa