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2. Lions Voice Clinic, University of Minnesota, Department of Otolaryngology, P.O. Box 487, 420 Delaware St., SE, Minneapolis, MN 55455, USA.
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4. Gastroesophageal Reflux Disease: A Clinician's Guide;Gitnick,2001
5. Time Frequency and Wavelets in Biomedical Signal Processing;Akay,1998