1. G. ‘t Hooft, “A planar diagram theory for strong interactions,” Nucl. Phys B72 (1974) 461.
2. J. Maldacena, “The large N limit of superconformal field theories and supergravity,” Adv. Theor. Math. Phys 2 (1998) 231 hep-th/9711200.
3. T. Banks, W. Fischler, S. H. Shenker and L. Susskind, “M theory as a matrix model: a conjecture,” Phys. Rev D55 (1997) 5112, hep-th/9610043.
4. N. Drukker, D. J. Gross and H. Ooguri, “Wilson loops and minimal surfaces,” Phys. Rev D60 (1999) 125006, hep-th/9904191.
5. N. Ishibashi, H. Kawai, Y. Kitazawa and A. Tsuchiya, “A large-N reduced model as superstring,” Nucl. Phys B498 (1997) 467, hep-th/9612115.