Effects of Zeeman spin splitting on the modular symmetry in the quantum Hall effect. - Da-Ren Hang; R. B. Dunford; Gil-Ho Kim; H. D. Yeh; C. F. Huang; David A. Ritchie; Ian Farrer; Y. W. Zhang; C.-T. Liang; Y. H. Chang (Microelectron. J., 2005)