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The term endophysics (lit. “physics from within”) was coined by the American physicist David Finkelstein in a letter to the German biochemist Otto E. Rössler, who originally came up with the concept. It refers to the study of how observations are affected and limited by the observer being within the universe.^{[clarification needed]} This is in contrast with "exophysics," which assumes a system observed from the “outside”.^{[clarification needed]}

• Physics
• Internal measurement (This notion is very similar to endophysics.)

• R. J. Boskovich, De spacio et tempore, ut a nobis cognoscuntur, partial English translation in: J. M. Child (Ed.), A Theory of Natural Philosophy, Open Court (1922) and MIT Press, Cambridge, MA, 1966, pp. 203–205.
• T. Toffoli, The role of the observer in uniform systems, in: G. J. Klir (Ed.), Applied General Systems Research, Recent Developments and Trends, Plenum Press, New York, London, 1978, pp. 395–400.
• K. Svozil, Connections between deviations from Lorentz transformation and relativistic energy-momentum relation, Europhysics Letters 2 (1986) 83–85.
• O. E. Rössler, Endophysics, in: J. L. Casti, A. Karlquist (Eds.), Real Brains, Artificial Minds, North-Holland, New York, 1987, p. 25.
• O. E. Rössler, Endophysics. Die Welt des inneren Beobachters, Merwe Verlag, Berlin, 1992, with a foreword by Peter Weibel.
• K. Svozil, Extrinsic-intrinsic concept and complementarity, in: H. Atmanspacker, G. J. Dalenoort (Eds.), Inside versus Outside, Springer-Verlag, Heidelberg, 1994, pp. 273–288.

• Saniga, Metod; Buccheri, Rosolino; Elitzur, Avshalom C. (3 October 2005). Endophysics, Time, Quantum And The Subjective - Proceedings Of The Zif Interdisciplinary Research Workshop (With Cd-rom). World Scientific. ISBN 978-981-4479-29-5. Retrieved 16 May 2024.

• Karl Svozil (2005). Computational universes. doi:10.1016/j.chaos.2004.11.055
• Interview with O. E. Rössler (in German) Vom Chaos, der Virtuellen Realität und der Endophysik

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