Apparatus 3 for hard gelatine capsule (in vitro)

Hi all!
Mayde some of you can help me.
We are going to develop solid dosage form with immediate release (hard gelatine capsule).
We have to use Apparatus 3 for routine Dissolution (to overcome problem with crosslinking of gelatine) and also for in vitro study.
Has anyone had the same experience?
What documents are regulating the current requirements?

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