“…Recently, these results by Ringel and Schmidmeier as well as the connections to Gorenstein projective modules have been further explored, see e.g. [Zha11, XZ12, LZ13, XZZ14, RZ17, Kül17, Kva17,Kva18]. Noting that H(A) ∼ = mod(A ⊗ kA 2 ) ∼ = mod ( A A 0 A ), where A 2 denotes the Dynkin quiver A 2 , the generalisations are in two directions: Firstly, they concern monomorphism categories for algebras of the form A ⊗ kQ where Q is a finite quiver, or more generally categories of functors Q → mod A where Q is a locally bounded quiver, and secondly monomorphism subcategories in module categories of algebras of the form ( A X 0 B ), where A and B is an Artin algebra and X is a B-A-bimodule.…”