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| 2 | Oskar Klein (1926) The Atomicity of Electricity as a Quantum Theory Law, Nature. 118 (2971): 516. |
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| 10 | C. Pope, Kaluza-Klein Theory, Texas A&M University, Lectıure Notes, (web adress last accessed in March 2026) https://people.tamu.edu/~c-pope/ihplec.pdf |