On the Forces, Stresses, and Fluxes of Energy in the Electromagnetic Field. Heaviside, O. Royal Society of London Proceedings Series I, 50:126–129, 1891.
bibtex   
@Article{         Heaviside_1891aa,
  author        = {Heaviside, Oliver},
  file          = {Heaviside_1891aa.pdf},
  journal       = {Royal Society of London Proceedings Series I},
  keywords      = {field,physics},
  langid        = {english},
  pages         = {126--129},
  title         = {On the Forces, Stresses, and Fluxes of Energy in the Electromagnetic Field},
  volume        = {50},
  year          = {1891}
}

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