https://scholar.google.com/scholar_lookup?title=Acellular+Dermal+Matrix+Graft+for+Gingival+Augmentation:+A+Preliminary+Clinical,+Histologic,+and+Ultrastructural+Evaluation&author=Scarano,+A.&author=Barros,+R.R.M.&author=Iezzi,+G.&author=Piattelli,+A.&author=Novaes,+A.B.&publication_year=2009&journal=J.+Periodontol.&volume=80&pages=253–259&doi=10.1902/jop.2009.080326