1. Abdalla, M.A., King, A.S.: The functional anatomy of the bronchial circulation of the domestic fowl. J. Anat. 121, 537–550 (1976)
2. Boyden, E.A.: Development of the human lung. In: Practice of Pediatrics, Vol. IV, Ch. 64, 1–17. Hagerstown: Harper and Row, 1975
3. Burger, R.E., Estavillo, J.A.: Pulmonary circulationvertebral—venous interconnections in the chicken. Anat. Rec. 188, 39–44, 1975
4. Delphia, J.M.: The origin of the air sacs in the White Pekin-Duck, Anas pZatyrhynchos L. Proc. North Dakota Acad. Sci. 12, 86–92 (1958)
5. Duncker, H.-R.: The lung air sac system of birds. Ergebn. Anat. Entwickl.-Gesch. 45, Heft 6, 1–171 (1971)