IN *ENZ, C.P. (ED.), V. MEYENN, K. (ED.): WOLFGANG PAULI* 407-430. (HELV. PHYS. ACTA 7 (1934) 709-731),
In *Miller, A.I.: Early quantum electrodynamics* 188-205, and In *Enz, C.P. (ed.): v. Meyenn, K. (ed.): Wolfgang Pauli* 407-430. Helv. Phys. Acta 7 (1934) 709-731