8Jane Stewart. A measured breath: new techniques in pulmonary imaging and diagnosis[J] . Can Med Assoc J. Mar. 15. 1996,154(6): 847 - 850.
9M. J. Musell. The need for standards in recording and analyzing respiratory sounds[J]. Med. Biol. Eng. Comput 1992, 30:129- 139.
10Jane Stewart. A measured breath: new techniques in pulmonary imaging and diagnosis [J ]. Canadian Medical Association Journal, 1996, 154(6) :847-850.