Javier Luca ya; A. L. Baert; Janet L. Strife; "4.6.5 Air Trapping", Pediatric Chest Imaging: Chest Imaging in Infants and Children, Springer, 2007, p. 92
Johny A. Verschakelen; W. De Weber; "5.2.2 Air Trapping", Computed Tomography of the Lung: A Pattern Approach, Springer, 2007, p. 51