Where can I find Mnesia source code?

I've seen in a lot of documents that Mnesia has been open sourced by Ericsson, but straightforward go开发者_如何学JAVAogling didn't help me to find the repository with the code...

Is Mnesia still open-source at all?

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It's part of the Erlang/OTP source code, which you can get from github. You can browse it here.