@article{perkins_1902, 
  title={Case of Combined Extra- and Intrauterine Pregnancy}, 
  volume={146}, 
  DOI={10.1056/nejm190203201461204}, 
  number={12}, 
  publisher={New England Journal of Medicine (NEJM/MMS)}, 
  author={PERKINS}, 
  year={1902}, 
  month={Mar}
  }