I mean, this is a no brainer. In some fields it is not easy to get a job. And in some cultures/some recruiters contact your references to "get a clear picture". What will your former boss[es] say, if the 10th person contacts them?

"I am more than happy to provide references that can back up my application but please understand that this is THE LAST STEP in the application process". Always worked for me.

Hint: The application process is often a good hint of things to come. Also, never go to an interview without a phone interview first to make sure you are on the same page.