1. A. Das and B. K. Chakrabarti, Rev. Mod. Phys. 80, 1061 (2008)
2. A. Hartmann and H. Rieger, Optimization in Physics (Wiley VCH, Darmstadt) (2002)
3. J. C. Angles d’Auriac, M. Preissmann and A. Seb, J. Math, and Comp. Model. 26 1 (1997)
4. H. Rieger, in Advances in Computer Simulation, Lecture Notes in Physics 501 edited by J. Kertesz and I. Kondor, Springer, Heidelberg (1998)
5. M. J. Alava, P. M. Duxbury, C. Motikarzel and H. Rieger, in Exact Combinatorial Algorithms: Ground States of Disordered Systems, Phase Transitions and Critical Phenomena 18 edited by C. Domb and J. L. Lebowitz Academic Press, New York (2001)