Where are the VBAP and VBAPSpeakerArray classes?

I found information on the internet about the SuperCollider classes VBAP and VBAPSpeakerArray to be able to pan over a speaker array.
But I can not find the classes. They seem to be dissapeared. They are also not available as a Quark.
Where can I find them?

You need the SC3plugins

Thx, that did the trick!