Weller, A. Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society;
Weller, A., & W VII-A Team (1977). On Sawtooth Oscillations and MHD-Modes in the W_VII_A Stellarator. In Controlled Fusion and Plasma Physics, Vol. 2 (pp. 127).