https://scholar.google.com/scholar_lookup?title=Enamel+Erosion+by+Some+Soft+Drinks+and+Orange+Juices+Relative+to+Their+PH,+Buffering+Effect+and+Contents+of+Calcium+Phosphate&author=Larsen,+M.J.&author=Nyvad,+B.&publication_year=1999&journal=CRE&volume=33&pages=81–87&doi=10.1159/000016499&pmid=9831784