@article{ullmann_wurstemberger_1904, 
  title={Ueber Derivate des Biphenylendiphenylmethans}, 
  volume={37}, 
  DOI={10.1002/cber.19040370115}, 
  publisher={Wiley}, 
  author={Ullmann and Wurstemberger}, 
  year={1904}
  }