http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
JONKMAN, Leffert: -- An E.S.R.-Study of nitroxides. - Groningen -- 1970.80 S.m.Fig.u.Tab.8° -- Groningen, nat.wiss.Diss.1970. -- 1976! -- M.