EWALD P. P., . (1962). Fifty years of X-ray diffraction. [s.l.]: [s.n.].
EWALD PETER PAUL, . 1962. Fifty years of X-ray diffraction. [s.l.]: [s.n.].
EWALD PETER PAUL, . Fifty years of X-ray diffraction. [s.l.]: [s.n.]. 1962.