@article{barger_ewins_1909, 
  title={LXX.—The action of phosphorus pentachloride on the methylene ethers of catechol derivatives. Part IV. Derivatives of dihydroxyphenyl-acetic, -glycollic, and -glyoxylic acids}, 
  volume={95}, 
  DOI={10.1039/ct9099500552}, 
  publisher={Royal Society of Chemistry (RSC)}, 
  author={Barger and Ewins}, 
  year={1909}
  }