@article { ISI:A1968A550400002, title = {CROSS SECTION FOR PRODUCTION OF SINGLY IONIZED HELIUM BY ELECTRON IMPACT AT LOW ENERGIES}, journal = {PHYSICAL REVIEW LETTERS}, volume = {20}, number = {6}, year = {1968}, pages = {241-\&}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.20.241}, author = {Brion, CE and THOMAS, GE} }