The size of the universe : attempts at a determination of the curvature radius of spacetime / by Ludwik Silberstein. Universe, The size of the. Silberstein, Ludwik, 1872- Relativity (Physics) QC6 .S48 513.82 SIS Includes bibliographical foot-notes. [London] : Oxford University Press, 1930. 1930. 1930 Text viii, 215, [1] p. : eng