TY - RPRT TI - Quantized Hall effect and quantum phase transitions in coupled two-layer electron systems. AU - S He AU - Das Sarma S AU - XC Xie PY - 1993 DO - 10.1103/physrevb.47.4394 UR - https://pubmed.ncbi.nlm.nih.gov/10006587/ ID - 10006587 ER -