@article{
  author = {Haji Shaabani, M., Fatehi, M., Farzi Haromi, M.},
  title = {Spectrum and essential spectrum of linear combinations of composition operators on the Hardy space H2},
  journal = {Journal of New Researches in Mathematics},
  year = {2019},
  volume = {5},
  number = {2},
  pages = {5-14},
  doi = {}
}