@article {Brion1969197, title = {Negative ion formation in the hexafluorides of sulphur, selenium and tellurium}, journal = {International Journal of Mass Spectrometry and Ion Physics}, volume = {3}, number = {3{\textendash}4}, year = {1969}, pages = {197 - 202}, issn = {0020-7381}, doi = {http://dx.doi.org/10.1016/0020-7381(69)85003-5}, url = {http://www.sciencedirect.com/science/article/pii/0020738169850035}, author = {C.E. Brion} }