https://scholar.google.com/scholar_lookup?title=The+Volume+of+Saliva+in+the+Mouth+Before+and+After+Swallowing&author=Lagerlof,+F.&author=Dawes,+C.&publication_year=1984&journal=J.+Dent.+Res.&volume=63&pages=618–621&doi=10.1177/00220345840630050201&pmid=6584462