1. Quoted by James Murphy in his introduction to Where is Science Going?, by Max Planck (1933, reprinted by Oxbow Press, Connecticut, 1981). S → P: You made arable a vast new ground Wherein I here and there a sprig of flowers found. P → S: What you have picked, what I have picked, These we will bind together Entwining thus a fair bouquet From gifts we send each other
2. in Les Prix Nobel en 1946 (Imprimerie Royale Norstedt & Soner, Stockholm, 1948), p. 123-130
3. in Recent Research in Molecular Beams: A Collection of Papers Dedicated to Otto Stern, Ed. I. Estermann (Academic Press, New York, 1959)
4. History of molecular beam research: Personal reminiscences of the important evolutionary period 1919–1933