@article{Leen1988, <br/>
            author = { Leen, T.M. and Graff, M.M. } ,<br/>title = "{Oxygen chemistry of shocked interstellar clouds. III - Sulfur and oxygen species in dense clouds}"  ,<br/> journal = {Astrophysical Journal} ,<br/> year = 1988 ,<br/> volume = 325 ,<br/> pages = {411-416}  ,<br/> doi = {10.1086/166013}  <br/> }