TY - JOUR AU - Murray Holland BT - Physical Review Letters DA - 1999-09 DO - 10.1103/PhysRevLett.83.2470 PY - 1999 SP - 2470 EP - 2470 T2 - Physical Review Letters TI - Holland Replies: UR - http://link.aps.org/doi/10.1103/PhysRevLett.83.2470 VL - 83 SN - 0031-9007 ER -