Rau, F. Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society;
Rau, F., Jaeckel, H., Martinelli, A., & Wipf, S. (1972). On the Performance of Nb_sub.3_Sn Test Coils for Levitated Multipoles, in L.He and in He Gas up to 17K. In Applied Superconductivity (pp. 325-330).