TY - JOUR AU - F. Robicheaux AU - Bo Gao BT - Physical Review Letters DA - Jan-11-1991 DO - 10.1103/PhysRevLett.67.3066 PY - 1991 SP - 3066 EP - 3069 T2 - Physical Review Letters TI - Two-photon processes in real atoms UR - http://link.aps.org/doi/10.1103/PhysRevLett.67.3066 VL - 67 SN - 0031-9007 ER -