RT Journal Article SR Electronic T1 Relativity and Modern Physics JF Science JO Science FD American Association for the Advancement of Science SP 539 OP 541 DO 10.1126/science.58.1513.539 VO 58 IS 1513 A1 Eisenhart, L. P. YR 1923 UL http://science.sciencemag.org/content/58/1513/539.abstract AB