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Hilbert, D. (1916) The Foundations of Physics (Second Communication). In: Janssen, M., Norton, J.D., Renn, J., Sauer, T. and Stachel, J., Eds., The Genesis of General Relativity, Springer, 1939-1961.
https://link.springer.com/chapter/10.1007%2F978-1-4020-4000-9_45

has been cited by the following article:

• TITLE: Kruskal Coordinates, Semi-Complex Extension of Spacetime

  AUTHORS: Jean-Pierre Petit

  KEYWORDS: Semi-Complex Extension, Kruskal Coordinates, Kruskal Diagram, Schwarzschild Geometry, Autoparallel Curves, Ghost Images, Ghost Geometry, Ghost Symmetry, Pseudo-Real Coordinates

  JOURNAL NAME: Journal of Modern Physics, Vol.17 No.9, September 29, 2026

  ABSTRACT: In this article, we re-examine the geometric nature of the extension of the Schwarzschild solution into the domain 0α and the inner region 0