@article{Yang17-71,
  title = {n},
  author = {Yan Yang},
  year = {2017},
  url = {https://amc-journal.eu/index.php/amc/article/view/823},
  researchr = {https://researchr.org/publication/Yang17-71},
  cites = {0},
  citedby = {0},
  journal = {Ars Math. Contemp.},
  volume = {12},
  number = {1},
  pages = {135-144},
}