Pirenne, M. H. The diffraction of X-rays and electrons by free molecules / M. H. Pirenne ... - Cambridge [Eng.] : The University Press, 1946. - xii, 160 p. : II pl. (incl. diagr.) on 1 l., diagrs. ; 21 cm. Bibliography: p. [146]-154. and index. Subjects--Topical Terms: X-rays.Electrons.Diffraction.Free molecules. Dewey Class. No.: 537.53 / PID 1946