@article{Tielens1982, <br/>
            author = { Tielens, A.G.G.M. and Hagen, W. } ,<br/>title = "{Model calculations of the molecular composition of interstellar grain mantles}"  ,<br/> journal = {Astronomy and Astrophysics} ,<br/> year = 1982 ,<br/> volume = 114 ,<br/> pages = {245-260}  <br/> }