Saunders R A, Milner A D, Hopkin I E
Early Hum Dev. 1978 Jul;2(2):107-14. doi: 10.1016/0378-3782(78)90002-6.
Pulmonary mechanics were measured in 22 normal, full-term babies as soon as quiet, regular breathing was established. The method included construction of tidal resistance profiles, by which it was demonstrated that 'air trapping' is probably not the major factor in establishing and maintaining the functional residual capacity immediately after birth.