@article{
  author = {Lu, Ming, Liu,, Xiaobing, Yu, Xiaoyu},
  title = {Improved preparation of 3,7-dinitro-1,3,5,7-tetraazabicyclo[3,3,1] nonane (DPT) from urea},
  journal = {Journal of the Iranian Chemical Research},
  year = {2010},
  volume = {3},
  number = {2},
  pages = {133-139},
  doi = {}
}