Googled the name, but almost all result pointed to Berger's preprint.
Is there any reference for this?



What is "Berger's isembolic inequality"?
See [Chris Croke's 2007 paper](http://www.ams.org/journals/proc/2008-136-02/S0002-9939-07-09079-X/S0002-9939-07-09079-X.pdf) for all you ever wanted to know.


