A clearer approach for defining unit systems

@article{Quincey2017ACA,
  title={A clearer approach for defining unit systems},
  author={Paul Quincey and Richard J.C. Brown},
  journal={Metrologia},
  year={2017},
  volume={54},
  pages={454 - 460}
}
We present the SI and other unit systems, including cgs-em and cgs-es, in a framework whereby a system of fully independent and dimensionally orthogonal base units is modified by conventions designed to simplify the equations that are used within each system. We propose that the radian can be seen as an independent unit whose dimensional status is modified in the SI and other unit systems for this purpose. This framework clarifies how different unit systems are interrelated, and identifies the… 
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