[1] M. Alizadeh, A. K. Das, H. R. Maimani, M. R. Pournaki and S. Yassemi, On the diameter and girth of zero-divisor graphs of posets, Discrete Appl. Math., 160 (2012) 1319–1324.
[2] G. Chartrand and O. R. Oellermann, Applied and Algorithmic Graph Theory, McGraw-Hill, Inc., New York, 1993.
[3] A. K. Das and D. Nongsiang, On Reduced Zero-Divisor Graphs of Posets, J. Discrete Math., 2015 (2015) pp. 7.
[4] B. A. Davey and H. A. Priestley, Introduction to Lattices and Order, second ed., Cambridge University Press, New York, 2002.
[5] R. Halas, Annihilators and ideals in ordered sets, Czechoslovak Math. J., 45 (1995) 127–134.
[6] R. Halas, Relative polars in ordered sets, Czechoslovak Math. J., 50 (2000) 415–429.
[7] R. Halas and M. Jukl, On Beck’s coloring of posets, Discrete Math., 309 (2009) 4584–4589.
[8] E. Neufeld and W. Myrvold, Practical Toroidality Testing, Proceedings of the eighth annual ACM-SIAM symposium on Discrete Algorithms, New Orleans, LA, 1997 574–580.
[9] A. T. White, Graphs, groups and surfaces, North-Holland Mathematics Studies, no. 8., American Elsevier Publishing Co., Inc., New York, 1973.