Persistent identifier https://phaidra.univie.ac.at/o:1747870
Handle https://hdl.handle.net/11353/10.1747870
URI https://valep.vc.univie.ac.at/virtualarchive/public/Springer-Verlag_Erna_Ungersbck_to_Carnap_1970-05-08_L_Original/dv:939849