TY - JOUR AU - Yong AU - W Johnson AU - M Rudd C2 - Physical Review A (Atomic, Molecular and Optical Physics) DA - 2000-03-01 LA - en M1 - 61 PB - Physical Review A (Atomic, Molecular and Optical Physics) PY - 2000 TI - Cross Sections for Singly Differential and Total Ionization of Helium by Electron Impact ER -