@article{ralph_1901, 
  title={SERUM TREATMENT OF DIPHTHERIA ON THE FOURTH DAY OF THE DISEASE.}, 
  volume={157}, 
  DOI={10.1016/s0140-6736(01)82561-7}, 
  number={4046}, 
  publisher={Elsevier BV}, 
  author={Ralph}, 
  year={1901}
  }