@article{
  author = {Salehi, Mahdi, Lari Dashtbayaz, Mahmoud, Makhmalbaf, Narges},
  title = {Minimizing portfolio variance with the limitations of (L)},
  journal = {Journal of Investment Knowledge},
  year = {2017},
  volume = {6},
  number = {21},
  pages = {81-96},
  doi = {}
}