TY - JOUR AU - S. Chen AU - D. Leep AU - Alan Gallagher BT - Physical Review A DA - Jan-03-1976 DO - 10.1103/PhysRevA.13.947 PY - 1976 SP - 947 EP - 952 T2 - Physical Review A TI - Excitation of the Sr and Sr+ resonance lines by electron impact on Sr atoms VL - 13 SN - 0556-2791 ER -