S. Akbari, A. Daemi, O. Hatami, A. Javanmard and A. Mehrabian, Zero-Sum Flows in Regular Graphs, Graphs
Combin., 2010 26 (2010) 603–615.
 S. Akbari, N. Ghareghani, G. B. Khosrovshahi and A. Mahmoody, On zero-sum 6-iflows of graphs, Linear Algebra
Appl., 430 (2009) 3047–3052.
 M. Baca and M. K. Siddiqui, Total edge irregularity strength of generalized prism, Appl. Math. Comput., 235 (2014)
 C. W. Chang, M. L. Chia, C. J. Hsu, D. Kuo, L. L. Lai and F. H. Wang, Global defensive alliances of trees and
Cartesian product of paths and cycles, Discrete Appl. Math., 160 (2012) 479–487.
 W. Imrich, S.Klavžar, Product Graphs, Structure and Recognition, John Wiley and Sons, New York, 2000.
 F. Jaeger, Flows and generalized coloring theorems in graphs, J. Combin. Theory Ser. B, 26 (1979) 205–216.
 D. F. Rall, Total domination in categorical products of graphs, Discussiones Mathematicae Graph Theory, 25 (2005)
 P. D. Seymour, Nowhere-zero 6-flows, J. Combin. Theory Ser. B., 30 (1981) 130–135.
 M. K. Siddiqui, M. Miller and J. Ryan, Total edge irregularity strength of octagonal grid graph, Utilitas Math., 103
 C. Tardif and D. Wehlau, Chromatic numbers of products of graphs: The directed and undirected versions of the
PoljakRodl function, J. Graph Theory, 51 (2006) 33–36.
 W. T. Tutte, A contribution to the theory of chromatic polynomials, Canad. J. Math., 6 (1954) 80–91.
 T. M. Wang and S. W. Hu, Zero-Sum Flow Numbers of Regular Graphs, Article in Lecture Notes in Computer
 T. M. Wang and S. W. Hu, Constant Sum Flows in Regular Graphs, In: Atallah, M. Li, X.-Y. Zhu, B. (eds.), 6681,
Springer, Heidelberg, 2011 168–175.
 T. M. Wang, S. W. Hu and G. Zhang, Zero-Sum Flow Numbers of Triangular Grids, Frontiers in Algorithmics
Volume of the series Lecture Notes in Computer Science, 8497 (2001) 264–275.
 T. M. Wang and G. H. Zhang, Zero-Sum Flow Numbers of Hexagonal Grids, In: M. Fellows, X. Tan, B. Zhu and
(eds.), 7924, Springer, Heidelberg, 2013 339–349.