@article{201909.0298, doi = {10.20944/preprints201909.0298.v1}, url = {https://doi.org/10.20944/preprints201909.0298.v1}, year = 2019, month = {September}, publisher = {Preprints}, author = {Liyan Chen and Samuel Cheng and Kanghang He and Lina Stankovic and Vladimir Stankovic}, title = {Undirected Graphs: Is the Shift-Enabled Condition Trivial or Necessary?}, journal = {Preprints} }