Persistent identifier https://phaidra.univie.ac.at/o:1478043
Handle https://hdl.handle.net/11353/10.1478043
URI https://valep.vc.univie.ac.at/virtualarchive/public/Folder_5_Copies_of_Lecture_I_and_Parts_of_II_and_III_1970_and_undated/a:711746