TY - JOUR AU - W. Robb AU - Michael Meadows AU - T. Burnett AU - Gary Doolen BT - Physical Review A DA - Jan-03-1977 DO - 10.1103/PhysRevA.15.1063 PY - 1977 SP - 1063 EP - 1067 T2 - Physical Review A TI - R-matrix calculation of third-order optical harmonic coefficients of atomic hydrogen and helium UR - http://link.aps.org/doi/10.1103/PhysRevA.15.1063 VL - 15 SN - 0556-2791 ER -