The following publications are possibly variants of this publication:
- On the maximum arc-chromatic number of digraphs with bounded outdegrees or indegreesChuandong Xu, Shenggui Zhang, Yi Wang. ipl, 115(12):939-944, 2015. [doi]
- Covering the edges of digraphs in D(3, 3) and D(4, 4) with directed cutsYandong Bai, Binlong Li, Shenggui Zhang. DM, 312(10):1596-1601, 2012. [doi]