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https://www.wikipt.org/tphysicsletters-ptl/huygens-principle-based-on-mutual-energy-flow-theorem-and-the-comparison-to-the-path-integral
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https://www.wikipt.org/tphysicsletters-ptl/huygens-principle-based-on-mutual-energy-flow-theorem-and-the-comparison-to-the-path-integral