Yu, Gexin

• The Electronic Journal of Combinatorics Volume 16, Issue 1 (2009) - Research Papers
  A New Lower Bound on the Density of Vertex Identifying Codes for the Infinite Hexagonal Grid
  Abstract  PDF
• The Electronic Journal of Combinatorics Volume 23, Issue 3 (2016) - Papers
  Extremal Permutations in Routing Cycles
  Abstract  PDF  source file (modified by imw)  Official Source
• The Electronic Journal of Combinatorics Volume 24, Issue 4 (2017) - Papers
  A Note on Chromatic Number and Induced Odd Cycles
  Abstract  PDF  Official source
• The Electronic Journal of Combinatorics Volume 25, Issue 3 (2018) - Papers
  Strong Chromatic Index of Graphs With Maximum Degree Four
  Abstract  PDF  source files  Official Source