Includes: ber die Krf̃tefreie bewegung in der Relativistischen Quantenmechanik (1930); Zur Quantendynamik des Elektrons (1931); Diracsches Elektron im Schwerefeld I (1932); Rate of n-fold Accidental Coincidences (1944); Affine Feldtheorie und Meson (1946); The Foundation of the Theory of Probability--I and II (1947); Die Besonderheit des Weltbilds der Naturwissenschaft (1947); 2400 Jahre Quantentheorie (1948); What is an elementary particle? (1950); A Combinatorial Problem in Counting Cosmic Rays (1951); Are There Quantum Jumps? Part I (1952); Unsere Vorstellung von der Materie (1952); The Philosophy of Experiment (1954); Measurement of Length and Angle in Quantum Mechanics (1954); A Thermodynamic Relation between Frequency-Shift and Broadening (1954).