TY - JOUR AU - H. Kleinpoppen AU - Eberhard Kraiss BT - Physical Review Letters DA - Jan-02-1968 DO - 10.1103/PhysRevLett.20.361 PY - 1968 SP - 361 EP - 363 T2 - Physical Review Letters TI - Cross Section and Polarization of the H_α Line by Electron Impact Excitation UR - http://link.aps.org/doi/10.1103/PhysRevLett.20.361 VL - 20 SN - 0031-9007 ER -