References
Li A, Randall M, Nattie EE: CO(2) microdialysis in retrotrapezoid nucleus of the rat increases breathing in wakefulness but not in sleep. J Appl Physiol. 1999, 87: 910-919.
Nattie EE, Li A: CO2 dialysis in the medullary raphe of the rat increases ventilation in sleep. J Appl Physiol. 2001, 90: 1247-1257.