@article{Herbst1989, <br/>
            author = { Herbst, E. and Millar, T. J. and 
Wlodek, S. and 
Bohme, D. K. } ,<br/>title = "{The chemistry of silicon in dense interstellar clouds}"  ,<br/> journal = {Astronomy & Astrophysics} ,<br/> year = 1989 ,<br/> volume = 222 ,<br/> pages = {205-210}  <br/> }