@article {Brion1968102,
	title = {Detection of monoenergetic electron impact excitation of helium using the sulphur hexafluoride negative ion},
	journal = {International Journal of Mass Spectrometry and Ion Physics},
	volume = {1},
	number = {1},
	year = {1968},
	pages = {102 - 104},
	issn = {0020-7381},
	doi = {http://dx.doi.org/10.1016/0020-7381(68)80010-5},
	url = {http://www.sciencedirect.com/science/article/pii/0020738168800105},
	author = {C.E. Brion and C.R. Eaton}
}
