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Max Planck - Wikipedia
Who was Max Planck? - JSTOR Daily
Max Planck – Nobel Lecture - NobelPrize.org
Max Planck (1858 - 1947) - Biography - MacTutor History of …
Max Planck - New World Encyclopedia
Max Planck Facts & Biography | Famous Physicists
Max Planck Formulates Quantum Theory - ThoughtCo
21.1 Planck and Quantum Nature of Light - Physics | OpenStax
Planck's Constant: The Number That Rules Technology, Reality, …
Max Planck - a biographical overview | Max-Planck-Gesellschaft