Zohm, H., Suttrop, W., Buchl, K., Blank, H. J. d., Gruber, O., Kallenbach, A., et al. (1995). Investigation of the bifurcation character of the H-mode in ASDEX Upgrade. Plasma Physics and Controlled Fusion, 37(4), 437-446. doi:10.1088/0741-3335/37/4/005.