@article{Vroom1969, <br/>
            author = { Vroom, D. A. and de Heer, F. J. } ,<br/>title = "{Production of Excited Atoms by Impact of Fast Electrons on Molecular Hydrogen and Deuterium}"  ,<br/> journal = {Journal of Chemical Physics} ,<br/> year = 1969 ,<br/> volume = 50 ,<br/> pages = {580-590}  ,<br/> doi = {10.1063/1.1671103}  <br/> }