EFFECTIVE RANGE THEORY AND MANY-BODY PERTURBATION THEORY APPLIED TO ELECTRON SPIN-POLARIZED ATOMIC HYDROGEN (H+) Y.H. Uang and W.C. Stwalley J. Phys. Colloques, 41 C7 (1980) C7-33-C7-38 DOI: 10.1051/jphyscol:1980706