Adding "site:.edu" or "site:.org" to your search string will limit results to college/university or organization websites, and exclude commercial ones.
Scholarly results from Google, including citation counts and journal metrics. Link is proxy-enabled to allow access to articles in the library collection from off campus. FAQ: Google Scholar Errors.
The following alternatives to Google place emphasis on scholarly results.
Multidisciplinary professional association for increasing the "knowledge and understanding of the ear, hearing and balance," and the prevention and treatment of hearing disorders.