Original scientific papers - Werner Heisenberg, Blum - Google Books

http://books.google.de/books?ei=FiTHTLb6DpXT4gaGwKizDw&ct=result&hl=en&id=1sknAQAAIAAJ&dq=halbzahlig+spin&q=halbzahlig+#search_a

This is the final volume of Heisenberg's Collected Works. It contains his papers on a (nonlinear) unified theory of elementary particles, as well as his contribution to superconductivity and multiparticle production. Especially interesting is the first…