1. The functional basis of pulmonary sounds;Forgacs;Chest,1978
2. Mechanics of Flow-Induced Sound and Vibration;Blake,1986
3. Monitoring the state of the human airways by analysis of respiratory sound;Hardin;Acta Astronaut,1979
4. Medical Instrumentation, Application and Design;Webster,1998
5. Heart sounds reduction from lung sounds recordings applying signal and image processing techniques in time-frequency domain;Pourazad,2004