https://scholar.google.com/scholar_lookup?title=Second+Order+Differentiation+Analysis+of+Micro+FTIR+Method+Revealed+the+Variable+Erosion+Characteristics+of+Carbonated+Soft+Drink+for+the+Individual+Human+Teeth+Enamel&author=Kono,+T.&author=Watanabe,+A.&author=Kanno,+T.&author=Ootani,+Y.&author=Tamamura,+R.&author=Sakae,+T.&author=Okada,+H.&publication_year=2019&journal=J.+Hard+Tissue+Biol.&volume=28&pages=7–12&doi=10.2485/jhtb.28.7