@article{emilewiez_kostanecki_1899, 
  title={Ueber das 3 - Aethoxy - Piperonalcumaranon}, 
  volume={32}, 
  DOI={10.1002/cber.18990320151}, 
  publisher={Wiley}, 
  author={Emilewiez and Kostanecki}, 
  year={1899}
  }