Seeing double: Leonardo’s Mona Lisa twin

@article{Asmus2016SeeingDL,
  title={Seeing double: Leonardo’s Mona Lisa twin},
  author={John F. Asmus and Vadim Parfenov and Jessica P. Elford},
  journal={Optical and Quantum Electronics},
  year={2016},
  volume={48},
  pages={1-11}
}
The conventional scientific tests employed in authenticating paintings are useful in excluding a work if, for a particular artist, incorrect parameters are discovered. For example, the date may be wrong (e.g., radio carbon dating), a pigment may be wrong (e.g., modern formulation), or an implausible underpainting or sketch may be revealed (e.g., X-ray or IR image). In contradistinction, an original approach is proposed to identify individual “fingerprints” for particular artists’ hands… 
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