http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
A contribution to pH measurements of oral microbial deposits
G r a f, Ruedi: A contribution to pH measurements
G r a f, Ruedi: A contribution to pH measurements -- of oral microbial deposits. -- Zürich 1970. 23 S. -- Zürich, Univ., med. Fak., Diss. v. 1970