[1] I. M. Bomze , M. Budinich, P. M. Pardalos and M. Pelillo, The maximum clique problem, Handbook of combi-natorial optimization, Supplement, Kluwer Acad. Publ., Dordrecht, A (1999) 1–74.
[2] S. Burer, R. D. C. Monteiro and Y. Zhang, Maximum stable set formulations and heuristics based on continuous optimization, Math. Program., 94 (2002) 137–166.
[3] L. Chen, J. Peng, B. Zhang and S. Li, Uncertain programming model for uncertain minimum weight vertex covering problem, J. Intell. Manuf., 28 2017 625-632.
[4] M. Djahangiri and A. Ghaffari-Hadigheh, Uncertain weighted dominating set: a prototype application on natural disaster relief management, Soft Comput., 22 (2018) 1003–1012.
[5] Y. Gao, Shortest path problem with uncertain arc lengths,Comput. Math. Appl., 62 (2011) 2591–2600.
[6] M. R. Garey and D. S. Johnson, Computers and Intractability: A Guide to the Theory of NP-Completeness, A Series of Books in the Mathematical Sciences. W. H. Freeman and Co., San Francisco, Calif., 1979.
[7] A. Ghaffari-Hadigheh, Roman domination problem with uncertain positioning and deployment costs, Soft Com-put., 24 (2020) 2637-2645.
[8] Sh. Han, Z. Peng and S. Wang, The maximum flow problem of uncertain network, Inform. Sci., 265 (2014) 167–175.
[9] B. Liu and Y. K. Liuand, Expected value of fuzzy variable and fuzzy expected value models, IEEE Trans. Fuzzy Syst., 10 (2002) 445–450.
[10] B. Liu, Uncertainty theory, Second edition. Studies in Fuzziness and Soft Computing, 154, Springer, Berlin, 2007.
[11] B. Liu, Some research problems in uncertainty theory, J. Uncertain Syst., 3 (2009) 3–10.
[12] B. Liu, Uncertain risk analysis and uncertain reliability analysis, J. Uncertain Syst., 4 (2010) 163–170.
[13] B. Liu, Toward uncertain finance theory, J. Uncertain. Anal. Appl., 1 (2013) 1–5.
[14] B. Liu, Uncertainty theory, 24, Springer, Berlin, 2015.
[15] E. Maslov, M. Batsyn and P. M. Pardalos, Speeding up branch and bound algorithms for solving the maximum clique problem, J. Global Optim., 59 (2014) 1–21.
[16] S. Rebennack, M. Oswald, D. O. Theis, H. Seitz, G. Reinelt and P. M. Pardalos, A branch and cut solver for the maximum stable set problem, J. Comb. Optim., 21 (2011) 434–457.
[17] F. Rossi and S. Smriglio, A branch-and-cut algorithm for the maximum cardinality stable set problem, Oper. Res. Lett., 28(2) (2001) 63–74.
[18] P. San Segundo, D. Rodríguez-Losada and A. Jiménez, An exact bit-parallel algorithm for the maximum clique problem, Comput. Oper. Res., 38 (2011) 571–581.
[19] E. Tomita and T. Kameda, An efficient branch-and-bound algorithm for finding a maximum clique with com-putational experiments, J. Global Optim., 37 (2007) 95–111.
[20] Y. Zhu, Uncertain optimal control with application to a portfolio selection model, Cybern. Syst. Int. J., 41 (2010) 535–547.