http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
D 149.192 -- WIERSMA, Douwe Alle: -- Photochromism through photodissociation.An -- ESR and optical study. - Groningen 1969. -- 75 S.m.Fig.8° -- Groningen,nat.wiss.Diss.1969. -- 1976! -- M.