@article{babuška_osborn_1999, 
  title={Can a finite element method perform arbitrarily badly?}, 
  volume={69}, 
  DOI={10.1090/s0025-5718-99-01085-6}, 
  number={230}, 
  publisher={American Mathematical Society (AMS)}, 
  author={Babuška and Osborn}, 
  year={1999}, 
  month={Feb}
  }