TY - JOUR AU - B. Granger AU - Chris Greene BT - Physical Review A DA - Jan-07-2000 DO - 10.1103/PhysRevA.62.012511 PY - 2000 T2 - Physical Review A TI - Extending closed-orbit theory using quantum-defect ideas: Basic concepts and derivations VL - 62 SN - 1050-2947 ER -