TY - JOUR AU - Blundell, S AU - Mohr, Peter AU - Johnson, W AU - Sapirstein, J C2 - Physical Review A (Atomic, Molecular and Optical Physics) DA - 1993-01-01 00:01:00 LA - en M1 - 48 PB - Physical Review A (Atomic, Molecular and Optical Physics) PY - 1993 TI - Evaluation of two-photon exchange graphs for highly charged heliumlike ions ER -