1. Splitting digraphs;Alon;Combin. Probab. Comput.,2006
2. N. Alon, J. Bang-Jensen, S. Bessy, Out-colorings of digraphs, arXiv:1706.06441v1.
3. Problems and results on judicious partitions;Bollobás;Random Struct. Algorithms,2002
4. On bisections of directed graphs;Hou;European J. Combin.,2017
5. Y. Ji, J. Ma, J. Yan, X. Yu, On problems about judicious bipartitions of graphs, arXiv:1701.07162.