@article{
  author = {Niknam, Khodabakhsh, Sajadi, Seyed Ahmad, Hosseini, Roghayeh, Baghernejad, Mojtaba},
  title = {Silica-bonded n-propyldiethylenetriamine sulfamic acid as a recyclable solid acid catalyst for the synthesis of coumarin and biscoumarin derivatives},
  journal = {Iranian Journal of Catalysis},
  year = {2014},
  volume = {4},
  number = {3},
  pages = {163-173},
  doi = {}
}