Four Poynting theorems

@article{Kinsler2009FourPT,
  title={Four Poynting theorems},
  author={Paul Kinsler and Alberto Favaro and Martin W. McCall},
  journal={European Journal of Physics},
  year={2009},
  volume={30},
  pages={983 - 993}
}
The Poynting vector is an invaluable tool for analysing electromagnetic problems. However, even a rigorous stress–energy tensor approach can still leave us with the question: is it best defined as E × H or as D × B? Typical electromagnetic treatments provide yet another perspective: they regard E × B as the appropriate definition, because E and B are taken to be the fundamental electromagnetic fields. The astute reader will even notice the fourth possible combination of fields, i.e. D × H… 

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