Permissive hypercapnia. How permissive should we be?

@article{Feihl1994PermissiveHH,
  title={Permissive hypercapnia. How permissive should we be?},
  author={F. Feihl and Claude Perret},
  journal={American journal of respiratory and critical care medicine},
  year={1994},
  volume={150 6 Pt 1},
  pages={1722-37}
}