1. Report 348;E. Balas,1974
2. M. Bazaraa and M. Shetty, Nonlinear programming (Wiley, New York, 1979).
3. E.M.L. Beale, “Branch-and-bound methods for mathematical programming,” in: P.L. Hammer, E.L. Johnson and B.H. Korte, eds., Discrete optimization II (North-Holland, Amsterdam, 1979).
4. G. Dantzig, Linear programming and extensions (Princeton University Press, Princeton, NJ, 1963).
5. R.G. Jeroslow, “Representations of unbounded optimizations as integer programs,” Journal of Optimization Theory and its Applications 30 (1980) 339–351.