@article{
  author = {Elmi, Bijan, Ramezani, Mojtaba},
  title = {The sociological study of effective tactics on viral marketing and its effect on 
purchasing behavior (Case study of Refah chain stores of East Azerbaijan province)},
  journal = {Sociological studies},
  year = {2011},
  volume = {4},
  number = {10},
  pages = {125-137},
  doi = {}
}