EXCITATION OF 3 3P LEVEL OF He AND 4 2F LEVEL OF He+ WITH ELECTRON BEAMS A. Luches, V. Nassisi, A. Perrone and M.R. Perrone J. Phys. Colloques, 40 C7 (1979) C7-67-C7-68 DOI: 10.1051/jphyscol:1979733