1. HansenB.(2009).What's that noise? Interpreting lung sounds. DVM 360 [Internet].http://veterinarycalendar.dvm360.com/whats‐noise‐interpreting‐lung‐sounds‐proceedings.
2. The Functional Basis of Pulmonary Sounds
3. Wheezes, crackles and rhonchi: simplifying description of lung sounds increases the agreement on their classification: a study of 12 physicians' classification of lung sounds from video recordings
4. Breath sound terminology in the veterinary literature;Roudebush P.;J. Am. Vet. Med. Assoc.,1989