@article{
  author = {Tabaraki, Reza, Safari, Alimohammad, Yeganeh Faal, Ali},
  title = {Ultrasonic-assisted extraction of condensed tannin from acron, gland, leaf and gall of oak using response surface methodology},
  journal = {Journal of Applied Chemical Research},
  year = {2013},
  volume = {7},
  number = {3},
  pages = {67-77},
  doi = {}
}