6. References
- Escudero , L. F. 1987 . “A Mathematical Formulation of a Hierarchical Approach for Production Planning in FMS,” . In Modern Production Management Systems Edited by: Kusiak , A. 231 – 245 .
- [2] IBM Corporation . 1988 . IBM Mathematical Programming System Extended/370 (MPSX/370), version 2 User's Guide, (Program Number 5668–739)