TY - JOUR AU - Arthur Phelps AU - B. Jelenković AU - L. Pitchford BT - Physical Review A DA - Jan-12-1987 DO - 10.1103/PhysRevA.36.5327 PY - 1987 SP - 5327 EP - 5336 T2 - Physical Review A TI - Simplified models of electron excitation and ionization at very high E/n VL - 36 SN - 0556-2791 ER -