Schemmel, Matthias Department Structural Changes in Systems of Knowledge, Max Planck Institute for the History of Science, Max Planck Society;
Schemmel, M. (2005). Curved universes before Einstein: Karl Schwarzschild's cosmological speculations. In J. Renn (Ed.), Albert Einstein - chief engineer of the universe: one hundred authors for Einstein (pp. 90-93). Weinheim: Wiley-VCH.