@article{haeberli_haegeman_1995, 
  title={Clause structure in Old English: evidence from Negative Concord}, 
  volume={31}, 
  DOI={10.1017/s0022226700000578}, 
  number={01}, 
  publisher={Cambridge University Press (CUP)}, 
  author={Haeberli and Haegeman}, 
  year={1995}
  }