@article{cherng_tao_2001, 
  title={Formation of ammonium halide particles from pure ammonia and hydrogen halide gases: A theoretical study on small molecular clusters (NH3–HX)n (n=1, 2, 4; X=F, Cl, Br)}, 
  volume={114}, 
  DOI={10.1063/1.1328392}, 
  publisher={AIP Publishing}, 
  author={Cherng and Tao}, 
  year={2001}, 
  month={Jan}
  }