@article{
  author = {Aghamollaei, Gh., Haj Aboutalebi, N.},
  title = {Some results on higher numerical ranges and radii of quaternion matrices},
  journal = {Journal of Linear and Topological Algebra},
  year = {2015},
  volume = {4},
  number = {4},
  pages = {283-288},
  doi = {}
}