@article{zurflüh_2008, 
  title={Metabolism and regulation of tetrahydrobiopterin and its implications for BH4-responsive hyperphenylalaninemia and BH4-deficiencies}, 
  DOI={10.5167/uzh-4340}, 
  publisher={University of Zurich}, 
  author={Zurflüh, M R}, 
  year={2008}
  }