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VALID INEQUALITIES AND PROJECTING MULTICOMMODITY EXTENDED FORMULATION FOR UNCAPACITATED FIXED CHARGE NETWORK FLOW PROBLEMS.
RARDIN, R.L., (1990)
GAINFREE LEONTIEF FLOW PROBLEMS.
JEROSLOW, R.G., (1989)
Fractal layout organization for job shop environments
Montreuil, B., (1999)