Grunfeld sidelines with Bf4

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Does anyone know if there are books on these two sidelines?

 

Gruenfeld Defense: Three Knights Variation, Hungarian Attack (D92)

Gruenfeld Defense: Brinckmann Attack (D82)

Can anyone tell me anything about these? From what I understand these are more solid alternatives to the mainlines, is that correct?
I came across these two when looking for a reply that grunfeld players dislike to play against but I find it hard to find material on it.