Werke: Veröffentlichte Schriften 1911 - Hans Kelsen, Matthias Jestaedt - Google Books

https://books.google.de/books?id=KFGtmL3zCdoC&pg=PA436&dq=rechtspflicht&hl=de&sa=X&redir_esc=y#v=onepage&q=rechtspflicht&f=false

English summary: Volume 2 of the historical-critical Complete Works edition of Hans Kelsen's writings (in chronological order) contains his Habilitation at the University of Vienna, published in 1911. In this monograph, entitled Main Problems in the Theory…