TY - JOUR AU - E. Heller AU - William Reinhardt BT - Physical Review A DA - Jan-01-1973 DO - 10.1103/PhysRevA.7.365 PY - 1973 SP - 365 EP - 367 T2 - Physical Review A TI - Comment on the Direct-Matrix Solution of a Singular Lippmann-Schwinger Equation VL - 7 SN - 0556-2791 ER -